| Type: | Alloy Steel Bar |
|---|---|
| Standard: | AISI, ASTM, GB, JIS, DIN, BS |
| Technique: | Hot Rolled |
| Application: | Structural Steel Bar, Tool Steel Bar, Die Steel Bar |
| Surface Treatment: | Black/Peeling/Polishing/Machining/Grinding/Turning |
| Alloy: | Alloy |
| Samples: |
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| Customization: |
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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.
| component | C | Si | Mn | P | S | Cr | Ni | Mo |
| minimum value | 0.17 | - | 0.65 | - | - | 0.4 | 0.4 | 0.15 |
| Maximum value | 0.23 | 0.4 | 0.95 | 0.035 | 0.035 | 0.7 | 0.7 | 0.25 |
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GB
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ISC
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CNS
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JIS
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KS
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ASTM/AISI
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UNS
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ISO
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DIN EN/DIN
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W-Nr.
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20CrNiMo
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A50202
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SNCM220
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SNCM220
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SNCM220
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8620
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G86200
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20NiCrMo2
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21NiCrMo2
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1.6523
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| Material Science: | Hot rolled/cold drawn/forged steel round steel |
| Process: | It is forged from vacuum degassed steel ingot. |
| Diameter: | 25mm - 1000mm (optional) |
| Length: | 1000mm-12000mm Straightness:3mm/M max(optional) |
| Process: | EAF+LF+VD+forging+heat treatment (optional) |
| Delivery conditions: | Hot forging+rough machining (black surface after Q/T)+double tempering. |
| Delivery time | 15-25 days |
| Minimum order quantity: | 5 tons |
| Heat treatment: | Normalizing/annealing/quenching/tempering (optional) |
| Technical data: | Chemical composition, physical properties and mechanical tests according to customer requirements |
| characteristic: | According to your requirements |
| Test: | Ultrasonic test according to SEP 1921-84 C/c and D/d (optional) |
| Tag: | Grade, heat resistant NO The length will be printed with the required color on each bar |
| Payment: | T T 30% in advance; The balance shall be paid against shipping documents or irrevocable letter of credit at sight before shipment |
| Terms of trade | FOB,C&F,EXW... |
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condition
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Heat treatment or condition
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tensile strength
σb Mpa |
Reduction of area
ψ % |
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Hot rolled bar and wire
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Spheroidizing annealing (GKZ) or spheroidizing annealing (GKZ)+peeling (SH)
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≤460
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≥65
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Pulling products
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Cold drawing (K)+spheroidizing annealing (GKZ)
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≤460
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≥65
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Pulling products
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Cold drawing (K)+spheroidizing annealing (GKZ)+finishing (K)
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≤490
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≥65
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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 welding properties are better than those of 20Ct. During cold deformation, the plasticity is high, the machinability is good, the hardenability is higher than the corresponding carbon steel, and the heat treatment has the tendency of overheating, decarburization sensitivity and temper brittleness
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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 making parts with small section size, it has good static strength and fatigue strength, good wire drawing, cold heading, and heat treatment processability, medium machinability, and weldability. Generally, it does not need to be welded. When welding is needed, the parts should be preheated to more than 200 ° C, with high hardenability, and small quenching deformation, But it is sensitive to overheating, decarburization 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 reduced. The plasticity during cold deformation is medium, the machinability is medium, the weldability is low, and there are white spot sensitivity, overheating tendency and temper brittleness tendency. Water cooling
is easy to produce cracks, and it is generally used in the quenched and tempered or normalized state |
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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, and has good heat treatment processability and machinability. It has 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 the quenched and tempered state
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45Mn2
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Medium carbon quenched and tempered steel, with high strength, wear resistance and hardenability, can obtain good comprehensive mechanical properties after quenching and tempering, and 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 when necessary. The machinability is fair, but the weldability is poor, the plasticity is low when cold deformation occurs, the heat treatment has the tendency of over heat sensitivity and temper brittleness, and cracks are easily produced when water cooling
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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 cracks are easy to occur in water cooling. Proper quenching and tempering treatment can obtain good comprehensive mechanical properties, which can be used after quenching and tempering, normalizing and tempering
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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 drawing
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