Characteristics of 40-brand steel

40 steel is used in long-life components that operate in temperatures up to 450°С. It conforms to the GOST 1050-88 standard.

Classification: High-grade structural carbon steel.

Product: Rolled products, including shaped.

 

Chemical composition of 40 steel, %

С

Si

Mn

Ni

P

S

Cr

As

Cu

Fe

0.37-0.45

0.17-0.37
0.5-0.8

<0.25

<0.035
<0.035

 <0.025

<0.08

<0.3

~97

 

Mechanical properties of 40 steel

Grade

Сondition of the goods

Creep limit, Rm (MPa)

 Short-term tensile strength ReH (MPa)

Minimum elongation ratio σ, %

Contraction ratio, %

GOST 1050

Normalisation

 335

570

19

45

DSTU 7809

Normalisation

335

570

19

45

Analogues to 40 steel

US  

1040, 1042, G10400, G10420

Germany  

1.0511, 1.1186, C40, C40E, C40R, C42D, Ck35, Ck40, Cm40

Japan

S40C, S43C, SWRCH38K, SWRCH40K

France

2C40, C40E, FR38, XC3841, XC38H1, XC42, XC42H1, XP42HI

UK

060A40, 080A40, 080M40, C40, C40E, CS40

EU

1.1186, C35, C40, C40E

Italy

C40, C40E, C40R

Belgium

C40-2

Spain

C40E

China

40, ML40

Sweden

1555, 1650

Bulgaria

40, C40E

Hungary

C40E

Poland

40, 40A, 40rs, D40, P40

Romania

OLC40, OLC40X

Czech Republic

12041

Australia

1040, M1040

South Korea

SM40C

 

Application

40 steel is widely used in piston rods, gear wheels, crankshafts, ring gears, flywheels, axles and bolts. It also features in medium-sized components like long axles, feed rods, cogs, etc, that are used in components for pipe fittings following preliminary quenching, which is conducted during the assembly of agricultural vehicles. 40 steel is used in fastenings for pipelines/boilers for thermal and nuclear power plants, and block/connecting components for turbines.

 

Welding

40 steel has limited welding capacity (to achieve a high-quality weld, the steel must be pre-heated before and annealed after the welding). The welding methods for this steel are manual-arc, automatic-arc and electroslag welding. Limitless contact welding can be applied.

 

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