| Customization: | Available |
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| Type: | Alloy Steel |
| Standard: | AISI, ASTM, GB, JIS, DIN, BS |
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Low alloy high strength steel is a kind of engineering structural steel developed by adding a small amount of Mn, Si, Nb, V, Ti, Al and other alloy elements on the basis of carbon structural steel. The so-called low alloy means that the total amount of alloy elements in steel does not exceed 3%. High strength is relative to carbon engineering structural steel. The development principle of low alloy high strength steel is to use as few alloying elements as possible to obtain as high comprehensive mechanical properties as possible, so as to meet the purpose of use and low cost. Low alloy high-strength steel can meet the requirements of large bearing capacity of various structures (such as large bridges, pressure vessels, ships, etc.) in engineering, and at the same time, it is required to reduce the dead weight of structures, improve reliability, and save materials and resources. This kind of steel is mainly used to manufacture various engineering structures with high strength requirements, such as bridges, ships, vehicles, high pressure vessels, oil and gas pipelines, large steel structures, etc. Because this kind of steel can obtain high strength without complex treatment process or even heat treatment, which greatly reduces the quality of engineering structures, it is used to replace general carbon structural steel.
| Grade | C | Si | Mn | Cr | Ni | Mo | P | S | Cu |
| 20Mn2 | 0.17-0.24 | 0.17-0.37 | 1.40-1.80 | ≤0.30 | ≤0.30 | ≤0.10 | ≤0.030 | ≤0.030 | ≤0.30 |
| SMn420 | 0.17-0.23 | 0.15-0.35 | 1.20-1.50 | ≤0.35 | ≤0.25 | ≤0.030 | ≤0.030 | ≤0.30 | |
| 1524 | 0.19-0.25 | 0.15-0.30 | 1.35-1.65 | - | - | ≤0.040 | ≤0.050 | ≤0.20 | |
| 22Mn6 | 0.18-0.25 | 0.10-0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.025 | ≤0.035 | ≤0.30 |
| 18Mn5 1.0436 |
0.15-0.20 | ≤0.40 | 0.90-1.60 | ≤0.30 | ≤0.30 | ≤0.08 | ≤0.025 | ≤0.015 | ≤0.30 |
| 30Mn2 | 0.27-034 | 0.17-0.37 | 1.40-1.80 | ≤0.30 | ≤0.30 | ≤0.10 | ≤0.030 | ≤0.030 | ≤0.30 |
| 50Mn2/50Mn7/1.0913 | 0.47-0.55 | 0.17-0.37 | 1.4-1.8 | ≤0.3 | ≤0.3 | ≤0.15 | ≤0.035 | ≤0.035 | ≤0.15 |
| SMn433 | 0.30-0.36 | 0.15-0.35 | 1.20-1.50 | ≤0.35 | ≤0.25 | - | ≤0.030 | ≤0.030 | ≤0.30 |
| 1330 | 0.28-0.33 | 0.15-0.35 | 1.60-1.90 | ≤0.20 | ≤0.25 | ≤0.60 | ≤0.035 | ≤0.040 | ≤0.35 |
| 28Mn6 | 0.25-0.32 | 0.10-0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.025 | ≤0.035 | ≤0.30 |
| 1.1170 | 0.25-0.32 | ≤0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.030 | ≤0.035 | ≤0.30 |
| Item | Hard Chromed Rod | Induction Hardened Chromed | Nickel and Chrome Plating Bars |
| Tolerance | ISOf7 | ISOf7 | ISOf7 |
| Roundness | Diameter tolerance / 2 | diameter tolerance / 2 | diameter tolerance / 2 |
| Standard Length | -for Ø ≤ 60 mm: 5600 -6200mm -for Ø≥60 mm: 5800 -7200mm Upon request: special lengths on all diameters |
- for Ø ≤ 60 mm: 5600 - 6200 mm - for Ø ≥ 60 mm: 5800 - 7200mm Upon request: special lengths on all diameters |
Up to 6000 mm Upon request: special lengths on all diameters |
| Surface Roughness | Ra max. 0.20 µm (statistic average: 0.05-0.15 µm) |
Ra max. 0.20 µm (statistic average: 0.05- 0.15 µm) |
Ra max. 0.20 µm (statistic average: 0.05-0.15 µm) |
| Chrome Layer Thickness | min. 900 HV (0.1) | min. 900 HV (0.1) | min. 25 µm |
| Straightness | ≤ Ø16 mm: max. 0.3 mm: 1000 mm > Ø16 mm: max. 0.2 mm: 1000 mm |
≤ Ø16 mm: max. 0.3 mm: 1000 mm > Ø16 mm: max. 0.2 mm: 1000 mm |
max.0.20 mm/1000 mm |
| Material | Diameter (thickness) d mm |
tensile strength σ b Mpa |
Yield point σ s Mpa |
Elongation or elongation after fracture δ % |
Hardness HBW |
Impact absorbed energy KV2 J |
| ASTM 1320 GB 20Mn2 | d=15 | ≥785 | ≥590 | ≥10 | ≤187 | ≥47 |
| ASTM 1330 GB 30Mn2 | d=25 | ≥785 | ≥635 | ≥12 | ≤207 | ≥63 |
| ASTM 1335 GB 35Mn2 | d=25 | ≥835 | ≥685 | ≥12 | ≤207 | ≥55 |
| ASTM 1340 GB 40Mn2 | d=25 | ≥885 | ≥735 | ≥12 | ≤217 | ≥55 |
| ASTM 1345 GB 45Mn2 | d=25 | ≥885 | ≥735 | ≥10 | ≤217 |
≥47 |
| GB 50Mn2 DIN 50Mn7 | d=25 | ≥930 | ≥785 | ≥9 | ≤229 | ≥39 |
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Brand
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Main characteristics
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20Mn2
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The properties of 20Mn2 and 20Cr with medium strength and small section size are similar, and the low-temperature impact
toughness and weldability are better than those of 20Ct. High plasticity during cold deformation, good machinability, higher hardenability than corresponding carbon steel, overheating, decarburization sensitivity and temper brittleness during heat treatment |
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30Mn2
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30Mn2 is usually used after quenching and tempering treatment. It has high strength, good toughness, and excellent wear
resistance. When manufacturing parts with small section size, it has good static strength and fatigue strength, good wire drawing, cold heading, and heat treatment process, medium machinability, and acceptable weldability. Generally, it does not make weldments. When welding is required, the parts should be preheated to above 200 ° C, with high hardenability, and small quenching deformation, However, it has overheating, decarburization sensitivity and temper brittleness |
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35Mn2
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The carbon content is higher than that of 30Mn2, so it has higher strength and better wear resistance. The hardenability is also
improved, but the plasticity is slightly decreased. During cold deformation, the plasticity is medium, the machinability is medium, the weldability is low, and there is white spot sensitivity, overheating tendency and temper brittleness tendency. Water cooling is easy to produce cracks, and it is generally used in quenched and tempered or normalized conditions |
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40Mn2
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Medium carbon quenched and tempered manganese steel is superior to 40 steel in strength, plasticity and wear resistance. It has
good heat treatment process and machinability, and poor weldability. When the carbon content is below *, it needs to be preheated to 100-425 ºC before welding. It has temper brittleness, overheating sensitivity, and water cooling is easy to produce cracks. It is usually used in quenched and tempered state |
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45Mn2
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Medium carbon quenched and tempered steel has high strength, wear resistance and hardenability. After quenched and tempered, it
can obtain good comprehensive mechanical properties. It is suitable for oil cooling and high-temperature tempering. It is often used in the quenched and tempered state, and can also be used in the normalized state if necessary. Its machinability is acceptable, but its weldability is poor, its plasticity is low during cold deformation, its heat treatment has a tendency of over-heat sensitivity and temper brittleness, and water cooling is easy to produce cracks |
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50Mn2
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Medium carbon quenched and tempered high strength manganese steel has high strength, high elasticity, excellent wear resistance,
high hardenability, good machinability, low cold deformation plasticity, poor welding performance, overheating sensitivity, white spot sensitivity and temper brittleness, and water cooling is easy to produce cracks. Proper quenching and tempering treatment can obtain good comprehensive mechanical properties, which can be used after quenching and tempering, and can also be used after normalizing and tempering |
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