DIWA 373 (EN 1.6368)

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Description

DIWA 373 is a weldable fine grained steel which is characterized by high yield strength at elevated tem- peratures. DIWA 373 is produced using basic oxygen steelmaking process. Its properties are achieved by normalizing and tempering or, for thicknesses exceeding 100 mm by normalizing and tempering or water quenching and tempering.

DIWA 373 is used as plate or formed part for boilers, pressure vessels, piping and other fabricated parts operating at temperatures up to 500 °C.

DIWA 373 / 15NiCuMoNb5-6-4, Material No. 1.6368, is standardized in EN 10028, part 2, for thicknesses up to 200 mm and qualified in accordance with VdTÜV material data sheet 377/1 for the application range of the AD 2000-Merkblätter in thicknesses up to 180 mm. This data sheet applies to heavy plates with thicknesses from 6 to 250 mm.

This material data has been provided by Dillinger.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

Mechanical

PropertyTemperatureValueTesting StandardComment

Charpy impact energy, V-notch

-20 °C

27 J

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*The specified values are minimum values for the average of 3 tests. No individual value is to be less than 70 % of the specified minimum. For plate thickness below 11 mm the test can be carried out on Charpy-V specimens or Charpy-V-type specimens with reduced width. The minimum impact value will be reduced proportionally to the reduction of the specimen’s cross section

0 °C

34 J

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*

Creep strength 10^4 cycles

400 °C

324 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

400 °C

402 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

410 °C

315 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

410 °C

385 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

420 °C

306 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

420 °C

368 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

430 °C

295 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

430 °C

348 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

440 °C

281 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

440 °C

328 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

450 °C

265 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

450 °C

304 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

460 °C

239 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

460 °C

274 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

470 °C

212 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

470 °C

242 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

480 °C

180 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

480 °C

212 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

490 °C

145 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

490 °C

179 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

500 °C

108 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles

500 °C

147 MPa

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rupture strength | average of the scatter band known to date., 10^4 cycles

Creep strength 10^5 cycles

400 °C

294 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

400 °C

373 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

410 °C

279 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

410 °C

349 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

420 °C

263 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

420 °C

325 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

430 °C

245 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

430 °C

300 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

440 °C

227 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

440 °C

273 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

450 °C

206 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

450 °C

245 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

460 °C

180 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

460 °C

210 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

470 °C

151 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

470 °C

175 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

480 °C

120 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

480 °C

139 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

490 °C

84 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

490 °C

104 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

500 °C

49 MPa

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Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles

500 °C

69 MPa

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rupture strength | average of the scatter band known to date., 10^5 cycles

Elongation

16 %

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min. for plate thickenss t ≤ 250 mm | transverse specimens (ambient temp.), A5

Tensile strength

580 - 740 MPa

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for plate thickness 150 < t ≤ 250 mm | transverse specimens (ambient temp.)

590 - 740 MPa

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for plate thickness 100 < t ≤ 150 mm | transverse specimens (ambient temp.)

600 - 760 MPa

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for plate thickness 60 < t ≤ 100 mm | transverse specimens (ambient temp.)

610 - 780 MPa

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for plate thickness t ≤ 60 mm | transverse specimens (ambient temp.)

Yield strength

400 MPa

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min. ReH for plate thickness 200 < t ≤ 250 mm | transverse specimens (ambient temp.)

410 MPa

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min. ReH for plate thickness 150 < t ≤ 200 mm | transverse specimens (ambient temp.)

420 MPa

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min. ReH for plate thickness 100 < t ≤ 150 mm | transverse specimens (ambient temp.)

430 MPa

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min. ReH for plate thickness 60 < t ≤ 100 mm | transverse specimens (ambient temp.)

440 MPa

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min. ReH for plate thickness 40 < t ≤ 60 mm | transverse specimens (ambient temp.)

460 MPa

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min. ReH for plate thickness t ≤ 40 mm | transverse specimens (ambient temp.)

100 °C

373 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

100 °C

382 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

100 °C

392 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

100 °C

401 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

100 °C

410 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

100 °C

429 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

150 °C

361 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

150 °C

370 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

150 °C

379 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

150 °C

388 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

150 °C

397 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

150 °C

415 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

200 °C

350 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

200 °C

359 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

200 °C

368 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

200 °C

377 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

200 °C

385 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

200 °C

403 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

250 °C

340 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

250 °C

349 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

250 °C

357 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

250 °C

366 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

250 °C

374 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

250 °C

391 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

300 °C

330 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

300 °C

338 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

300 °C

347 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

300 °C

355 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

300 °C

363 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

300 °C

380 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

350 °C

318 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

350 °C

327 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

350 °C

335 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

350 °C

342 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

350 °C

350 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

350 °C

366 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

400 °C

305 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens

400 °C

313 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

400 °C

320 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

400 °C

328 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

400 °C

335 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

400 °C

351 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

450 °C

288 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 250 mm | transverse specimens

450 °C

295 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens

450 °C

302 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens

450 °C

309 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens

450 °C

317 MPa

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EN 10028-2

min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens

450 °C

331 MPa

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EN 10028-2

min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

Chemical properties

PropertyValueComment

Aluminium

0.01 %

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min. tot. product

0.015 %

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min. tot. heat

Carbon

0.17 %

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max. heat

0.19 %

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max. product

Chromium

0.3 %

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max. heat

0.35 %

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max. product

Copper

0.4 - 0.9 %

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product

0.5 - 0.8 %

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heat

Iron

Balance

Manganese

0.75 - 1.3 %

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product

0.8 - 1.2 %

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heat

Molybdenum

0.22 - 0.54 %

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product

0.25 - 0.5 %

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heat

Nickel

0.9 - 1.4 %

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product

1 - 1.3 %

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heat

Niobium

0.005 - 0.055 %

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product

0.015 - 0.045 %

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heat

Nitrogen

0.02 %

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max. heat

0.022 %

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max. product

Phosphorus

0.025 %

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max. heat

0.03 %

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max. product

Silicon

0.2 - 0.56 %

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product

0.25 - 0.5 %

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heat

Sulfur

0.01 %

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max. heat

0.013 %

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max. product

Technological properties

Property
Application areas

Boilers in accordance with EN 12952/ EN12953 (TRD 101) for temperatures up to 500 °C.

Pressure vessels in accordance with AD 2000-Merkblatt W1, HP 8/1, EN 13445 and CODAP 2005 for temperatures from -20 °C up to 500 °C.

Cold Forming

DIWA 373 can be cold formed according to the general procedures. CEN/TR 10347 (Guidance for forming of structural steels in processing) as well as the provisions of VdTÜV-material data sheet 377/1 shall be observed.

Delivery condtion

Delivery condition:

thicknesses ≤ 100 mm normalized and tempered

thicknesses > 100 mm normalized and tempered or water quenched and tempered


In accordance with EN 10028-2 a water quenching and tempering treatment is already possible for thick- nesses equal or superior to 100 mm.

If the heat treatment is to be performed during processing, the plates can be delivered in the normalized condition, and in exceptional cases in the as rolled condition by special agreement before the order. In this case testing of the mechanical properties is provided on the basis of simulated heat treated specimens.


General technical delivery requirements: Unless otherwise agreed, the general technical delivery requirements in accordance with EN 10021 apply.

Flame cutting and welding

DIWA 373 can be welded and flame cut according to the general procedures. The guidelines given in EN 1011 (Welding), as well as the provisions of VdTÜV-material data sheet 377/1 shall be observed.

General note

If special requirements, which are not listed in this material specification, are to be met by the steel due to its intended use or processing, these requirements are to be agreed before the order.

The indications in this data sheet are product descriptions. This data sheet is updated if necessary. The current version is available from the mill or as download at www.dillinger.de.

Heat Treatment

Austenitizing/Cooling/Tempering¹Stress relieving
Austenitizing: 880-940 °C
580 - 620 °C²
- Cooling: After temperature equalization (880-940 °C) over the whole section
cooling in air or water according to plate thickness.
- Tempering: 640-680 °C After equalization over the whole section holding time at least 30 min.
≤ 15
> 15 ≤ 60
> 60
≥ 30
≥ 2 x t
120
Cooling in still air
1) Temperatures and times concern the product. Temperatures and holding times are determined by the
steel manufacturer as a function of the plate thickness and the chemical composition. In order to preserve
the mechanical properties the fabricator should ensure that the subsequent heat treatments correspond to
those applied by the manufacturer (indicated in the plate inspection document).
2) Higher temperatures and holding times exceeding 180 minutes are possible upon agreement.


If stress relieving and tempering are joined together in one process, the tempering conditions apply.

Hot forming

DIWA 373 can be hot formed according to the general procedures. CEN/TR 10347 (Guidance for forming of structural steels in processing) as well as the provisions of VdTÜV-material data sheet 377/1 shall be observed.

Processing history

Fully killed, fine grained steel with metallurgical treatment in the ladle.

Processing methods

The entire processing and application techniques are of fundamental importance to the reliability of the products made from this steel. The user should ensure that his design, construction and processing meth- ods are aligned with the material, correspond to the state-of-the-art that the fabricator has to comply with and are suitable for the intended use. The customer is responsible for the selection of the material. The recommendations in accordance with EN 1011-2 should be observed.

Surface condition

Surface condition: Unless otherwise agreed, the provisions in accordance with class B2 of EN 10163-2 are applicable.

Testings

Sampling, testing method and tests are in accordance with the provisions in EN 10028. For orders in accor- dance with VdTÜV material data sheet 377/1, the conditions indicated there are respected. Additional tests can be agreed upon. The plates are delivered with inspection certificate 3.1 or 3.2 in accordance with EN 10204. The document type and, in case of inspection certificate 3.2, the inspection representative are to be stated on the order.

Tensile test at ambient temperature (transverse test specimens), Tensile test at elevated temperature (transverse specimens in accordance with 10028-2)

For plate thicknesses ≥ 15 mm, the fulfilment of one of the three quality classes Z15, Z25 or Z35 in accordance with EN 10164 or similar standards can be stipulated on the order.

Tolerances

Tolerances: Unless otherwise agreed, tolerances are in accordance with EN 10029, with class B for the thickness and class N for the flatness.