Acidur 4307 +AT

Alternative and trade names
Acidur 4307, 1.4307, Type 304L, F304L, X2CrNi18-9
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Description

Due to advances in the production of stainless steels, namely reduction of the carbon content to very low levels, 1.4307 has all but replaced the titanium stabilised 1.4541 grades. 1.4307 is just as resistant to intercrystalline corrosion as the titanium grades and does not suffer from knifeline corrosion. 1.4307 also has a much better surface finish than the titanium stabilised grade and can be readily mechanically and electropolished. Due to the absence of titanium additions and the resulting hard precipitates, 1.4307 is much more machinable than 1.4541 which allows higher cutting speeds and results in longer tool life.

Related Standards

Equivalent Materials

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

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

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Properties

General

PropertyValue

Density

7.9 g/cm³

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Dimension

PropertyValueComment

Diameter

250 mm

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max.

Mechanical

PropertyTemperatureValue

Charpy impact energy, V-notch

100.0 J

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Elastic modulus

20 °C

200 GPa

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100 °C

194 GPa

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200 °C

186 GPa

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300 °C

179 GPa

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400 °C

172 GPa

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500 °C

165 GPa

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Hardness, Brinell

215.0

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Tensile strength

500.0 - 700.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.000016 1/K

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for 20°C to the mentioned temperature

200 °C

0.0000165 1/K

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for 20°C to the mentioned temperature

300 °C

0.000017 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000175 1/K

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for 20°C to the mentioned temperature

500 °C

0.000018 1/K

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for 20°C to the mentioned temperature

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Specific heat capacity

500.0 J/(kg·K)

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Thermal conductivity

15 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

7.3e-07 Ω·m

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Chemical properties

PropertyValue

Carbon

0.03

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Chromium

17.5 - 19.5 %

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Manganese

2.0

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Nickel

8.0 - 10.5 %

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Nitrogen

0.1

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Phosphorus

0.045

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Silicon

1.0

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Sulfur

0.03

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Technological properties

Property
Application areas

Automotive industry, Building and Construction industry, Chemical industry, Food and Beverage industry, Decorative items and Kitchen Utensils, Electronic Equipment, Petrochemical industry

Corrosion properties

Due to the low carbon content of 1.4307, there is virtually no tendency for the formation of chromium carbides and the associated chromium depleted regions that would form around these precipitates. Resistance to intergranular corrosion is thus far superior to 1.4301. Since this grade of stainless steel is still resistant to intergranular corrosion after welding, i.e. in the sensitised condition, corrosion testing in accordance with the following corrosion testing specifications is thus sufficient to establish resistance to corrosion: AFNOR NF 05-159 – ASTM A262-75. Practice E – DIN EN ISO 3651-2 - 1.4307 is resistant to corrosion in most natural waters and urban and rural atmospheres, provided that the chloride and salt contents are low. This grade of stainless steel is not resistant to sea water and as such must not be used in any sea water applications. As with 1.4301, this steel is not suited for use in swimming pools or swimming pool environments. Resistance to reducing acids is also confined to low concentrations and low temperatures. Optimal material properties are realised after solution annealing in the temperature range . PRE = 16.5 – 20.26

General machinability

For applications which require machining, the NIRO-CUT® 4307 grade is recommended since the composition and production route followed to produce this steel compensates for the work hardening tendency of the material. The following cutting parameters are thus proposed as a guideline when using coated hard metal cutting tools.

Heat Treatment

Optimal material properties are realised after solution annealing in the temperature range 1000 °C – 1100 °C followed by rapid cooling in air or water. During operation and fabrication, the time spent in the temperature range 450 °C – 850 °C must be minimised to avoid embrittlement. In the solution annealed condition

Hot forming

It is formable at 900-1200°C

Processing history

Solution Annealed

Welding

1.4307 is weldable with or without the use of filler material. If a filler metal is required, then the use of Novonit® 4316 (AISI 308L) would be recommended. Post weld heat treatment is not necessary