20Cr hot rolled steel sheet

GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel. GB 20Cr Alloy steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. GB 20Cr steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces.

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Steel Round Bars

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Product Details

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 sheet 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 profile

Adhering to the tenet of "integrity first, quality for survival", the company has established a complete marketing channel of "based in North China, radiating the whole country, and facing the world", and has not only established a solid strategic partnership with many domestic and foreign enterprises.We have been committed to product development, production and sales, after more than ten years of efforts, our products have been widely used in various fields.

Packing method: Packing according to customer's requirement.

The company has more than 110,000 square meters of production and processing base, fully introduced the international advanced modern automatic production and processing equipment, and took the lead in passing the ISO9001, TS16949, BV, SGS and other international well-known institutions certification.The products are mainly exported to Italy, Mexico, South Korea, Israel, Turkey, India, Pakistan, Kyrgyzstan, Oman, Kazakhstan, Vietnam, Myanmar and other countries. The company's supply is sufficient, the variety is complete, order production is fast, welcome domestic and foreign manufacturers, traders to contact us.

Company Advantages
1. We are a large-scale production enterprise integrating production, research and development, and can customize the products required by customers.
2. We have a perfect after-sales service system, which can track the problems encountered by customers in production at any time and provide corresponding technical support, so as to share our high-quality resources with customers.
3. After more than ten years of development, the company has complete product varieties and large inventory, which can be delivered in the shortest time.
4. Free samples are available.
5. With obvious price advantage, the company has complete production process, from raw materials to finished products integrated production can maximize the cost savings.