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Specifications

Introduction
BS EN 10269 is the material standard for stainless and heat-resisting steels, a selection of low alloy steels and some nickel alloys for fasteners. The standard includes some elevated and sub-zero temperature mechanical properties and can be used for specifying fasteners for pressure purposes. Austenitic, martens tic and precipitations hardening stainless grades are included. The ambient temperature mechanical properties shown in this article include 0.2% proof strength, tensile strength, elongation, reduction in area and impact (chirpy) strength in the finally heat treated condition.
 
Application:
Steam industry: fasteners for high temperature environment, manifolds and turbine parts
Gas turbine industry: turbofan discs
Characteristics:
Good resistance to high temperature oxidation

 

Chemical composition (cast analysis)

Material designation

Chemical composition, % by mass

name

number

C

Si

Mn

P max.

S max.

Al tot

B

Cr

Mo

Ni

V

Others

40CrMoV4-6

1.7711

0.36 to 0.44

≤0.40

0.45 to 0.85

0.030

0.030

≤0.15

　

0.90 to1.20

0.50 to0.65

　

0.25 to 0.35

　

1) Elements not listed in this table may be not intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addtion of such elements from scrap and other materials used in production which would impair mechanical properties and the usefulness of the sheet. 

2) A controlled sulfur content of 0.015 to 0.030% improves the mechinability and is therefore recommended.

 
                     Guidance for heat treatments of products in accordance with this European Standard

Material designation

Heat treatment symbol 1)

Normalizing, quenching or solution annealing temperature ℃

Type of cooling 2)

Tempering or precipitation treatment temperature (and time) 3) ℃

Name 

Number

Steels for quenching and tempering

40CrMoV4-6

1.7711

﹢QT 4)

880 to 950

o

670 to 720 

﹢QT 5)

940 to 970

o

600 to 700

1) + QT= quenched and tempered                                       2)o=oil       

3) Where in acordance with 8.2.3 a stress relieving after straightening has been agreed, the stress relieving temperature shall be chosen so that the specified properties are still obtained. 

4) For diameters≤100                                                       5) For diameters>100 to ≤160mm