GB 40Mn
GB 40Mn is a high-quality alloy steel with excellent wear resistance, strength and toughness, which is often used in the manufacture of high-speed railway tracks, construction machinery wheels, excavator buckets and various mechanical parts. This kind of steel is widely used and brings a lot of convenience to our life.
As a high-quality material, GB 40Mn has first been recognized and trusted by various industries. In the construction of high-speed railways, railway engineers are very satisfied with the wear resistance and strength of GB 40Mn, they believe that this material can improve the service life of railway tracks, reduce unnecessary maintenance, and make railway systems more stable and reliable. At the same time, in the field of industrial machinery, GB 40Mn's high strength and impact resistance are also widely used, and the construction machinery and excavators manufactured have higher durability and safety, and can withstand greater loads and pressures.
Although the material hardness is high, GB 40Mn is more suitable than other steel materials and has better machinability, so it performs well in the manufacturing process. This brings many benefits to manufacturers, enabling them to produce high-quality machine parts and equipment more efficiently. At the same time, it also means that customers can get more cost-effective products and enjoy better after-sales service.
1. Specification range: diameter 10-350mm, length 3-12m.
2. Surface treatment: bright, black and hammer flower surface treatment, to adapt to the requirements of different use environment.
3. Tensile strength: The tensile strength of the steel is between 550-800MPa, which can meet the strength requirements.
4. Toughness: The toughness of the steel is good, the yield strength is ≥305MPa, and the elongation is ≥16%.
5. Machinability: The steel can be processed by cold drawing, cold drawing, quenching and annealing, etc., and the treated material has the advantages of high strength and high hardness.
| Category | Type | Steel grade | Standard | Country |
|---|---|---|---|---|
| Grades | Special Alloy | 40Mn | GBT | China |
Chemical composition%of the ladle analysis
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Cu(%) |
|---|---|---|---|---|---|---|---|
| 0.37-0.44 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 |
| Proof strength Rp0.2(MPa) |
Tensile strength Rm(MPa) |
Impact energy KV(J) |
Elongation at fracture A(%) |
Reduction in cross section on fracture Z(%) |
As-Heat-Treated Condition | Brinell hardness(HBW) |
|---|---|---|---|---|---|---|
| 362(≥) | 948(≥) | 43 | 12 | 13 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 143 |
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