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20Cr hot rolled steel bars
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20Cr hot rolled steel bars
Product introduction
GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HRc. GB 20Cr steel Annealing delivery hardenss less than 250HB.20Cr With a lower carbon content range, So GB 20Cr alloy steel have good weldability.
GB 20Cr alloy steel equivalent specification: ASTM A29/A29M, DIN EN 10083/3, JIS G4053 and GB/T 3077. GB 20Cr equivalent steel round bar and flat bars can be cut to your required sizes. China steel 20Cr hot rolled and forged steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. GB 20Cr steel equivalent material bars are supplied in round, square and flat shapes.
GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel. It belongs to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered GB 20Cr Steel Hardness is 28-34 HRc. GB 20Cr steel Annealing delivery hardenss less than 250HB. With a lower carbon content range, GB 20Cr alloy steel equivalents have good weldability.
GB 20Cr forged steel bar and hot rolled steel bar is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Mostly used in the manufacture of the demand is higher, intensity of heart surface wear, under section under 30 mm or small carburized parts of complex shape and load (oil quenching), such as: transmission gear, gear shaft, CAM, worm, piston pin, claw clutch, etc
Compared with 15Cr steel, it has higher strength and hardenability. The critical hardening diameter in oil reaches 4-22mm, and the critical hardening diameter in water reaches 11-40mm, but its toughness is poor. There is a tendency for grains to grow, and direct quenching at cooling has a greater impact on impact toughness. Therefore, after carburizing, secondary quenching is required to improve the toughness of the part core without temper brittleness; steel has high cold strain plasticity and can be drawn in cold conditions. ; Machinability is good under high temperature normalizing or quenching and tempering state, but poor after annealing; 20Cr is pearlite, with good weldability, generally does not need heat treatment after welding, but parts with a thickness greater than 15mm need to be preheated before welding When it reaches 100～150℃, tempering heat treatment is not required after welding.
Product parameters
Technical data
20Cr hot rolled steel bars Chemical Composition
| Chemical Composition (%) | ||||||||
| Steel Grade | C | Si | Mn | P | S | Cr | Ni | Cu |
| 20Cr | 0.18～0.24 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | 0.70～1.00 | ≤0.030 | ≤0.30 |
Mechanical properties
| Yield strength σs/MPa (>=) | Tensile strength σb/MPa (>=) | Elongation δ5/% (>=) |
Reduction of area ψ/% (>=) |
Impact absorbing energy Aku2/J (>=) | Hardness HBS 100/3000 max |
| ≧540 | ≧835 | ≧10 | ≧40 | ≧47 | ≦179 |
Equivalent Of 20Cr alloy Structure Steel
| USA | Germany | China | Japan | France | England | Italy | Poland | ISO | Austria | Sweden | Spain |
| ASTM/AISI/UNS/SAE | DIN,WNr | GB | JIS | AFNOR | BS | UNI | PN | ISO | ONORM | SS | UNE |
| 5120 / G51200 | 20Cr4 / 1.7027 | 20Cr | SCr420 | 18C3 | 527A20 | 20Cr4 |
Heat treatment Related
- Annealing of 20Cr Alloy structural steel
Slowly heated to 850 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The 20Cr alloy steel will get MAX 250 HB （Brinell hardness）.
- Hardening of GB Alloy structural steel 20Cr
First quenching heated slowly to 880°C, Then after adequate soaking at this temperature quench in oil or water. Temper as soon as tools reach room temperature. Second quenching heat to 780-820°C， then quenching in oil or water.
- Tempering of 20Cr Alloy structural steel
Heat to 20°C, then cool in water or oil.normal delivery hardness 179HB Min.
Applications
GB 20Cr steel is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Mostly used in the manufacture of the demand is higher, intensity of heart surface wear, under section under 30 mm or small carburized parts of complex shape and load (oil quenching), such as: transmission gear, gear shaft, CAM, worm, piston pin, claw clutch, etc.; For the heat treatment deformation and high abrasion resistance parts, should be high frequency surface quenching after carburizing, such as modulus is less than 3 of the gear, shaft, spline shaft, etc. This steel can be used in the quenched and tempered state and used in the manufacture of large and medium under impact load in her work parts, this kind of steel also can be used as a low carbon martensite steel quenching, further increasing steel yield strength and tensile strength increased (about 1.5 ~ 1.7 times). Typical applications such as valve bodies, pumps and fittings, Shaft, the high load of wheel, bolts, double-headed bolts, gears, etc
Regular size and Tolerance
Steel round bar: Diameter Ø 5mm – 3000mm
Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm
Steel Hexagonal bar: Hex 5mm – 105mm
Others 20Cr have not specified size, pls contact our experienced sales team.
Processing
GB 20Cr alloy steel round bar and flat sections can be cut to your required sizes. 20Cr alloy steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. GB 20Cr steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.
Factory video
Shandong Mingding Supply Chain Management Service Co., Ltd. was established in 2013, focusing on the production, processing and trade of metal materials. We have a professional team to provide quality service, we sincerely welcome customers at home and abroad to visit our company for guidance and long-term cooperation.
Warehouse storage
The company has the most advanced production equipment and automatic control system, to ensure the most reliable product quality. In addition, we also have a professional international trade and logistics team. With quality products and excellent service, we have established a large number of long-term customers all over the world.
Packing and delivery
To better ensure the safety of your goods, professional, environmentally friendly, convenient and efficient packaging services will be provided.
Production Technology
Our main products include high quality carbon steel, stainless steel products,galvanized steel products, aluminum and copper. We can also provide cutting, punching, bending, polishing, shearing, wire drawing and other related service.
Honor
Application
Our company is set production processing and trade as one. The company has the most advanced production equipment and automatic control system, to ensure reliable product quality and sufficient supply capacity. Our main products are stainless steel, silicon steel, galvanized steel, carbon steel, aluminum products and other series. Applicable to engineering, coal mining, shipping, aviation, boiler, machinery, military and other fields. We sincerely welcome customers from all over the world to visit our company to discuss long-term cooperation.
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FAQ
How do you package the product?
The inner layer is covered with waterproof paper, packed in iron and secured by fumigated wooden brackets. It can effectively protect products from corrosion in the process of sea sample transportation.
Are the products inspected before shipment?
Of course. All our products go through strict quality tests before they are packed. Those that fail will be destroyed.
Can I visit your factory?
Of course. We welcome customers from all over the world to visit our factory.
What certifications have your products passed?
We have ISO 9001, SGS, EWC and other certifications.
Can you provide samples?
Of course, we can send samples all over the world. Our samples are free of charge, but the customer needs to bear the Courier charge
What is the loading port?
Normally, we ship from Shanghai, Tianjin, Qingdao and Ningbo ports. You can choose other ports according to your needs.
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Add：Shan Gang Building, 61-11 South Gongye Road, Jinan Area, China (Shandong) Pilot Free Trade Zone
MD Steel
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info@mingdingsteel.com
+8615553113555