OTAI SPECIAL STEEL is SNCM439 steel stockholders and suppliers from china. more 16 years experience in round bar, flat bar, Hexagonal and plate supply.
JIS SNCM439 is a high quality mechanical engineer steel, It belong to the high quality medium carbob, low alloy steel. Oil Quenched & Tempered Hardenss is 28-34 HRc. Annealing delivery hardenss less than 250HB.
Related Specifications JIS G4103 GB/T 3077 ASTM AISI A29/A29M DIN 17200 EN 10083
SNCM439 properties as below: PDF Files DOWN
SNCM439 Steel Form of Supply
JIS SNCM439 Alloy steel be supplied the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. Round bar can be sawn to your required lengths as one offs or multiple cut pieces. Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.
Round bar: 5mm to 1400mm x Legnth
Plate: Thickness 6mm to 1800mm x Width 200 -2300mm x Length
Flat bar: 5-50mm x 10 -105mm x Length
Hexagonal: HEX 5-110 mm x Length
Chemical composition
| C(％) | 0.36～0.43 | Si(％) | 0.15～0.35 | Mn(％) | 0.60～0.90 | P(％) | ≤0.030 |
| S(％) | ≤0.030 | Cr(％) | 0.60～1.00 | Ni (％) | 1.60～2.00 | Mo(％) | 0.15～0.30 |
Heat treatment Related
- Forged of JIS SNCM439 steel
Slowly heated the SNCM439 steel material to 650-680°C before raising the temperature to 1050-1210°C and soak SNCM439 Steel material until uniformly heated. Initial hammer blows should be light due to the comparatively high hot strength of this steel. Slowly cool after forged is essential to avoid the possibility of cracking.
- Annealing of SNCM439 steel
The Slowly heated JIS SNCM439 to 830-860 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The SNCM439 steel will get MAX 250 HB （Brinell hardness）.
- Hardening of SNCM439 Alloy steel
Heat to 830-865°C.Then either air cool or oil quench.
- Tempering of JIS SNCM439 Steel
JIS SNCM439 alloy steel should be in the heat treated or normalized and heat treated condition before tempering. Tempering temperatures depend upon the desired strength level.
Mechanical Properties
The mechanical properties of JIS SNCM 439 steels are outlined in the following table.
| Bulk modulus (typical for steels) | Tensile Strength | Shear modulus | Poisson’s ratio | Yield Strength | Reduction of area | |
| GPa | MPa | GPa | MPa | 70-800℃ | ||
| 140 | 745 | 80 | 0.27-0.30 | 470 | 50% | |
Applications
JIS SNCM439 steel usage is widely. Its applications such as shafts, gears, bearing, bolts, nuts, pins and couplings.
Regular size and Tolerance
- Normal diameter tolerance is 0-2mm, Thickness 0-2mm.
Others JIS SNCM436 have not specified size, pls contact our experienced sales team.
AISI A8 tool steel round bar and flat sections can be cut to your required sizes. A8 ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. AISI A8 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.
Contact our experienced sales team to help you with your A8 tool steel questionsadn enquiry by Email or Telphone. The A8 steel questions will be reply in 24 hours.
