20X2H4A
2026-06-10 14:03:33 Origin： Remark：0 Click：
ГОСT 4543 -1971 Chromium - Nickel steel 20X2H4A round bar heat treated forgings plate stock available ESR ingot 20X2H4A hot bloomed, rolled, forged, cold drawn rod
TECHNICAL DATA SHEET - 20X2H4A
Material type: 1.45Cr - 3.45Ni - 0.2C base alloy steel
Technical specification: ГОСT 4543 -1971
Available from stock: round bar 20 ~ 230 mm
Typical chemical compositions (mass weight - %)
Carbon, C (％): 0.16 ~ 0.22
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.025
Chromium, Cr (％): 1.25 ~ 1.65
Nickel, Ni (%): 3.25 ~ 3.65
Molybdenum, Mo (％): -
Ferrum, Fe (%): balance.
Material type: 1.45Cr - 3.45Ni - 0.2C base alloy steel
Technical specification: ГОСT 4543 -1971
Available from stock: round bar 20 ~ 230 mm
Typical chemical compositions (mass weight - %)
Carbon, C (％): 0.16 ~ 0.22
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.025
Chromium, Cr (％): 1.25 ~ 1.65
Nickel, Ni (%): 3.25 ~ 3.65
Molybdenum, Mo (％): -
Ferrum, Fe (%): balance.
MECHANICAL PROPERTIES - HEAT TREATMENT PRACTICE
Heat treatment temperature / ℃, annealing: -
Heat working temperature / ℃: 1150 ~ 850
Heat treatment temperature / ℃, quenching: 780, oil cooled
Heat treatment temperature / ℃, tempering: 180, oil or water cooled
Hardness under annealing condition ≤ HBW: 269
Tensile strength, Rm ≥ MPa: 1175
Yield strength, Rp0.2 ≥ MPa: 1070
Elongation, A5 ≥ (%): 9.0
Reduction of area, Z ≥ (%): 45.0
Impact strength, AK ≥ J: 78
Hardness after final heat treatment / HBW: -
PRODUCT DESCRIPTION
20X2H4A is usually produced by EAF + VD + LF / BEF followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers' requirements.
Bars are usually supplied bright in the annealed condition, or bright annealing specially.
Final heat treatment: quenched and tempered.
Rod / round bar / disc (diameter): 6.0 ~ 950 mm
Square bar / flat bar (width) : 10 ~ 600 mm
Plate / sheet via cold & hot rolled / forged: THK 0.5 ~ 300 X wide 20 ~ 1000 X L mm
TYPICAL APPLICATIONS
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Steel bar and steel forgings for barrel of middle-small caliber quick firing arms.
Power generation, turbine fasteners, boiler support rods.
Process plant, fasteners, Mechanical gears, gear shaft, main axis, valve rod.
TECHNICAL SALES ASSISTANCE & SERVICE
20+ years focus on special steel manufacturing and processing.
Stock over 60 grades with a competitive price, along with cutting service for specific requirement.
Customizing special material is welcome.
Final heat treatment: quenched and tempered.
Rod / round bar / disc (diameter): 6.0 ~ 950 mm
Square bar / flat bar (width) : 10 ~ 600 mm
Plate / sheet via cold & hot rolled / forged: THK 0.5 ~ 300 X wide 20 ~ 1000 X L mm
TYPICAL APPLICATIONS
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Steel bar and steel forgings for barrel of middle-small caliber quick firing arms.
Power generation, turbine fasteners, boiler support rods.
Process plant, fasteners, Mechanical gears, gear shaft, main axis, valve rod.
TECHNICAL SALES ASSISTANCE & SERVICE
20+ years focus on special steel manufacturing and processing.
Stock over 60 grades with a competitive price, along with cutting service for specific requirement.
Customizing special material is welcome.
Raw material available from stock
Custom 450 / C450 / XM-25 (S45000), 403 ESR, AISI 616 / 422 ESR, B50A365 / 403Cb+
17-4PH / 630, M-152 / 1.4938 / S151, S159, FV520B / S143 / 1.4594. X22CrMoV12-1
13Х11Н2B2MФ / AE961W, 11Х11Н2B2MФ / 16Х11Н2B2MФ
AISI 615 / S41800, 15-5PH / XM-12 (S15500), A-286 AISI 660 / S66286
10705BU, 10705MBU, 10705AJ, S111, S131, S154
Custom 450 / C450 / XM-25 (S45000), 403 ESR, AISI 616 / 422 ESR, B50A365 / 403Cb+
17-4PH / 630, M-152 / 1.4938 / S151, S159, FV520B / S143 / 1.4594. X22CrMoV12-1
13Х11Н2B2MФ / AE961W, 11Х11Н2B2MФ / 16Х11Н2B2MФ
AISI 615 / S41800, 15-5PH / XM-12 (S15500), A-286 AISI 660 / S66286
10705BU, 10705MBU, 10705AJ, S111, S131, S154
JIANGYOU LONGHAI SPECIAL STEEL CO.,LTD
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