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The content of sulfur, phosphorus and other non-metallic inclusions in high-quality carbon structural steel is lower than that in ordinary carbon structural steel. According to the difference of carbon content and use, this kind of steel can be roughly divided into three categories: | composition | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 5140/40Cr/SCr440/SCr440H/41Cr4/ 1.7035/41Cr4 | 0.37-0.44 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | ≤0.15 |
| 15CrMo/SCM415/15CrMo5/1.7262 | 0.12-0.18 | 0.17-0.37 | 0.4-0.7 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | 0.4-0.55 |
| 20CrMo/SCM420/4118/18CrMo4/20CrMo5/ 1.7264/1.7243 | 0.17-0.24 | 0.17-0.37 | 0.4-0.7 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | 0.15-0 .25 |
| 30CrMo/4130/SCM420/25CrMo4/1.7218 | 0.26-0.34 | 0.17-0.37 | 0.4-0.7 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | 0.15-0.25 |
| 35CrMo | 0.32-0.4 | 0.17-0.37 | 0.4-0.7 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | 0.15-0.25 |
| 4140/4142/42CrMo/SCM440/42CrMo4/ 1.7225/42CrMoS4 | 0.38-0.45 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | 0.9-1.2 | ≤0.3 | ≤0.3 | 0.15-0.25 |
| 4150 | 0.48-0.53 | 0.15-0.35 | 0.75-1 | ≤0.035 | ≤0.04 | 0.8-1.1 | ≤0.25 | ≤0.25 | 0.15-0.25 |
| 4340/34CrNi3Mo/SNCM447/ 36CrNiMo6/1.6582 | 0.38-0.43 | 0.15-0.35 | 0.6-0..85 | ≤0.035 | ≤0.04 | 0.7-0.9 | 1.65-2 | - | 0.2-0.3 |
| 5120/20Cr/SCr420 /SCr420H /20Cr4/1.7027/20CrMn/20CrMnTi | 0.17-0.22 | 0.15-0.35 | 0.7-0.9 | ≤0.035 | ≤0.035 | 0.7-0.9 | ≤0.25 | ≤0.35 | ≤0.06 |
| Category | Grade | Diameter | Standard |
| High speed steel | 6542,M2,M35,M42 | 1mm-600mm | GB/T3077-1999 |
| Mold steel | Cr12,Cr12MoV,Cr12Mo1V1,D2,SKD11,DC53 | 1mm-600mm | GB/T3077-1999 |
| Carbon structure steel | Q195, Q215, Q235, Q275 | 1mm-600mm | GB/T700-2006 |
| Low alloy high strength structure steel | Q295, Q345, Q390, Q420, Q460 | 1mm-600mm | GB/T1591-2006 |
| Prime Carbon structure steel | 10#, 20#, 35#, 45#, 60#, 20Mn, 65Mn, B2, B3, JM20, SH45,S45C, C45 | 1mm-600mm | GB/T699-1999 |
| Alloy structure steel | 30Mn2, 40Mn2, 27SiMn, 42Crmo,20Cr, 40Cr, 20CrMo, 35CrMo, 20CrMnTi, 30CrMnTi,20MnVB, 20MnTiB, 20CrNiMo, Q345B, 35MnBM,40MnB,36Mn2V, 45MnV, | 1mm-600mm | GB/T3077-1999 |
| Spring Steel | 65Mn, 60Si2Mn, 50CrVA | 1mm-600mm | GB/T1222-2002 |
| Bearing Steel | GCr15, GCr15GD,55SiMoV | 1mm-600mm | GB/T18254-2002 |
| Structural steels subject to end-quench hardenability requirements | 20CrMnTi, 30CrMnTi, 20Cr, 40Cr, 30CrMo, 42CrMoA, 27SiMn, 40Mn2H, 20CrNiMo, 40Mn2, q345b, 35MnBM, 40MnB,45MnV. | 1mm-600mm | GB/T5216-2002 |
Mainly used in the manufacture of complex shape, high mechanical performance requirements, and in the process is difficult to use forging method forming more important mechanical parts, such as automobile gearbox housing, locomotive and vehicle coupler and coupling
quenching heat treatment of steel
Quenching heat treatment is to heat carbon steel to AC3 or AC1 above 30-50°C, after heat preservation in different cooling media for rapid cooling (cooling rate is greater than the critical cooling rate), in order to obtain martensitic structure (M). The quenched structures consist of martensite and residual austenite.
1. Determination of quenching temperature According to different materials, the critical temperature AC3 or AC1 can be found in Table 1, and then the heating temperature can be obtained by adding 40°C.
2. The determination of insulation time parts with the furnace heating to reach the required heating temperature, but also for a period of time of insulation, to ensure that the whole parts evenly and fully reach the required temperature. Obviously, the holding time is related to the size and shape of the workpiece. By measuring the size of the parts, and then refer to Table 2, calculate the insulation time of the specimen.
3. Selection of cooling medium Cooling is the key process of quenching. It directly affects the properties of quenched steel. The quenching cooling rate should be greater than the critical cooling rate to obtain the supercooled martensite structure. At the same time, in the cooling process, the internal stress in the crystallization process should be controlled to prevent deformation and cracking. In order to ensure the quenching effect, the appropriate cooling medium and cooling method should be selected. In this experiment, we choose water at room temperature as the cooling medium.
4. Put the workpiece into the furnace, set the heating control temperature of the electric furnace temperature controller, and start heating.
5. After the electric furnace reaches the set temperature, the timing of heat preservation begins.
6. The workpiece comes out of the oven and is quickly put into water to cool.
Packaging | 1. by bundles, each bundle weight under 3 tons, for small outer diameter steel bars, each bundle with 4 - 8 steel strips. 2. after making by bundle, covered with Polyethylene waterproof cloth. 3. make black paints painting on each bar, then make bundles |
| 20 feet container contains dimension | Length under 6000mm |
| 40 feet container contains dimension | Length under 12000mm |
| By bulk vessel | Freight charge is low by bulk cargo, and large heavy sizes can not be loaded into containers can shipping by bulk cargo |
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.
2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese
6. How can we get your price?
A. We need the following information to quote for you:
1). Product Name
2). standard
3). Material grade (chemical composition)
4). dimension
5). amount
6). Special part drawin
