AISI ASTM Solid Steel Rod / Stainless Steel Round Bar Rod High Precision

The standard steel number of China's GB is 40Cr;

chemical composition
C: 0.37 ~ 0.44
Si: 0.17 ~ 0.37
Mn: 0.50 ~ 0.80
Cr: 0.80 ~ 1.10
Ni: ≤0.30
P: ≤0.035
S: ≤0.035
Cu: ≤0.030
Mo: ≤0.10
German DIN standard material number 1.7035 / 1.7045, German DIN standard steel number 41Cr4 / 42Gr4;
British EN standard steel number 18, British BS standard steel number 41Cr4;
French AFNOR standard steel number 42C4, French NF standard steel number 38Cr4 / 41Cr4;
Italy UNI standard steel number 41Cr4;
Belgium NBN standard steel number 42Cr4;
Swedish SS standard steel number 2245;
American AISI / SAE / ASTM standard steel number 5140;
Japanese JIS standard steel number SCr440 (H) / SCr440;
ISO Standard Steel Number 41Cr4.
【Critical point temperature】
(Approximate value) Ac3 = 780 ℃
【Normalizing Specification】
Temperature 850 ~ 870 ℃, hardness 179 ~ 229HBW.
【Specifications for softening cold pressed blanks】
The temperature is 740 ~ 760 ℃, the holding time is 4 ~ 6h, and then the cooling rate is 5 ~ 10 ℃ / h, and the temperature is reduced to ≤600 ℃.
Hardness before treatment ≤217HBW, hardness after softening ≤163HBW.
[Pig iron scrap protection swing tempering specification]
(670 ± 10) ℃ × 2h, increase with the furnace, (710 ± 10) ℃ × 2h, decrease with the furnace;
(670 ± 10) ℃ × 2h, heat up with the furnace, (710 ± 10) ℃ × 2h, then cool down with the furnace;
(670 ± 10) ℃ × 2h, heat up with the furnace, (710 ± 10) ℃ × 2h, cool down with the furnace;
A total of 3 cycles, and then reduce the temperature to 550 ℃, air cooling. The hardness after treatment is 153 HBW.
[Specifications for quenching and tempering]
Quenching temperature 850 ℃ ± 10 ℃, oil cooling; tempering temperature 520 ℃ ± 10 ℃, water, oil, air cooling.

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We have own entire system for pre-sale, in-sale and after-sale process. And our business scope covers technical consultation, technology development, technology projects and technology service in the field of manufacturing and selling the special steel plate, super stainless steel, titanium and nickel alloys, chrome moly alloys, aluminum alloys products etc. All the materials can be provided with the shape of plate, bar, pipe, tube, wire, beams, flange, fittings etc. The business of our group was separated into four parts: precision machining of special metal, special metal selling in domestic market, special metal selling in global market, special metal supply chain derivative services(such as agent purchasing, agent selling, supply chain finance etc).
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