GB 40CrMnMoS86 / DIN 1.2312 / AISI P20 + S acuan keluli flat bar

steel grade:

P20+S/1.2312/ 40CrMnMoS86

specification:

Round bars 60-800mm flats 40-350x100-1000mm

Delivery condition:

EAF+LF+VD+(ESR),forged, annealed, UT tested, peeled or machined

Chemical composition:

C:0.35-0.45 Mn:1.40-1.60 Si:0.30-0.50 Cr:1.80-2.00 Mo:0.15-0.25 P: ≤0.03 S:0.05-0.10

Tolerance:

0/+2mm

UT grade:

SEP1921,Group3, class D/d

Payment item:

T/T,L/C

Delivery time:

30 days or up to the quantity

GB

DIN

AISI

40CrMnMoS86

1.2312

P20+S

Standard

C

Si

Mn

Cr

Mo

P

S

GB/T1299-2000

0.35-0.45

0.30-0.50

1.40-1.60

1.80-2.00

0.15-0.25

≤0.03

0.05-0.10

Soft Annealing

Heat to 710-740°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 230.

Stress Relieving

Stress relieving to remove machining stresses should be carried out by heating to approx. 650°C, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening

Harden from a temperature of 830-880oC followed by oil or quenching or warm bath quenching 180-220°C. Hardness after quenching is 51 HRC.

Tempering

°C

100

200

300

400

500

600

700

HRC

51

50

48

46

42

36

28