S165M QT900 Bar

Alternative and trade names
S165M, ALLOY 1.4418, S165M, 2387
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Description

S165M is a high strength low carbon martensitic/ austenitic stainless steel. It combines high strength, good fatigue resistance with good weldability, properties which are maintained after welding. Two minimum tensile levels are often used; QT760 and QT900. QT900 is mostly used by the industry.

Related Standards

Equivalent Materials

Properties

Dimension

Diameter

d

10 - 410 mm

Mechanical

Charpy impact energy, V-notch

aK,charpy,V-notch

32 J at -40 °C

Elongation

A

16 % at 20 °C

Hardness, Brinell

HB

280 - 340 [-] at 20 °C

Tensile strength

Rm

900 - 1100 MPa at 20 °C

Yield strength Rp0.2

Rp0.2

750 MPa at 20 °C

Chemical properties

Element

Weight %

Comment

Fe

-

Balance

Cr

15 - 17 %

Ni

4 - 6 %

Mo

0.8 - 1.5 %

Mn

0.6 - 1.5 %

More

Technological properties

Application areas

The alloy has been designed to resist erosion corrosion or cavitation experienced in hydraulic applications. General areas for applications: Shafts, propellers, spindles, bolts, etc.

Corrosion properties

S165M is designed for application in slightly corrosive environment. Corrosion resistance is at the level of AISI 304L in most environments, however insensitive to intergranular corrosion.

Heat Treatment

Austenitize and quench from 950 to 1050°C and immediate temper at 600°C for 8 hours followed by cooling in air.

Welding

Good, the low carbon martensite with the finely dispersed residual austenite yields an excellent HAZ toughness in the as welded condition. Preheating to 100°C – 200°C is suggested for very thick section or when the stress concentration after cooling require it.

This material data has been provided by Sverdrup Steel.

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.