GJB 20Cr2Ni4A
2024-12-09 12:44:12 Origin： Remark：0 Click：
GJB 1220A Material Specification for Alloy Structure Steel Bar for Artillery Parts 20Cr2Ni4A Stock Available Round bar 20Cr2Ni4A Tube and Forgings
MATERIAL DESIGNATION - GJB 20Cr2Ni4A
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
PRODUCT DESCRIPTION
The alloy 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.
Stock Available: Round bar diam. 20 ~ 180 mm. ESR ingot, rolling blank.
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
PRODUCT DESCRIPTION
The alloy 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.
Stock Available: Round bar diam. 20 ~ 180 mm. ESR ingot, rolling blank.
MATERIAL SPECIFICATIONS - GJB 1220A - 2008 0
PRODUCT PROFILE & DIMENSIONS
Round bar & rod & disc (diameter): 5.5 ~ 800mm
Square bar & flat bar: T6 ~ 400 X W 15 ~ 650 X Lmm
Length: Fixed length or random length or based on the customer's special requirement.
Plate & Sheet steel: T0.5 - 200mm X W10 - 1500mm X Lmm
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.
Power generation – turbine fasteners – boiler support rods.
Process plant – fasteners, Mechanical gears, gear shaft, main axis, valve rod
Mechanical parts - connecting rod, bolt and nuts.
Multidiameter shaft, Pressure vessel parts.
TYPICAL CHEMICAL COMPOSITIONS (mass weight - %)
Carbon, C (％): 0.17 ~ 0.23
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.020
Chromium, Cr (％): 1.25 ~ 1.65
Nickel, Ni (%): 3.25 ~ 3.65
Molybdenum, Mo (％): -
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): -
Titanium, Ti (%): -
Ferrum, Fe (%): remainder.
Round bar & rod & disc (diameter): 5.5 ~ 800mm
Square bar & flat bar: T6 ~ 400 X W 15 ~ 650 X Lmm
Length: Fixed length or random length or based on the customer's special requirement.
Plate & Sheet steel: T0.5 - 200mm X W10 - 1500mm X Lmm
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.
Power generation – turbine fasteners – boiler support rods.
Process plant – fasteners, Mechanical gears, gear shaft, main axis, valve rod
Mechanical parts - connecting rod, bolt and nuts.
Multidiameter shaft, Pressure vessel parts.
TYPICAL CHEMICAL COMPOSITIONS (mass weight - %)
Carbon, C (％): 0.17 ~ 0.23
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.020
Chromium, Cr (％): 1.25 ~ 1.65
Nickel, Ni (%): 3.25 ~ 3.65
Molybdenum, Mo (％): -
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): -
Titanium, Ti (%): -
Ferrum, Fe (%): remainder.
HEAT TREATMENT PRACTICE - MECHANICAL PROPERTIES AT RM.
Heat treatment temperature /℃| annealing: -.
Heat treatment temperature /℃| Normalizing: -
Heat treatment temperature /℃| Quenching: 880 oil cool
Heat treatment temperature /℃| Tempering : 200 water / air.
Hardness after annealing ≤ HBW: 269
Tensile strength, Rm ≥ MPa: 1180
Yield strength, Rp0.2 ≥ MPa: 1108
Elongation, A ≥ (%): 10.0
Reduction of area, Z ≥ (%): 45.0
Impact strength, AKu ≥ J: 63
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.
We closely cooperate with the professional inspection partners to strictly control the quality and improve the quality manage system, and guarantee the goods delivery each time. It is proved that we are worth of trusting and will be the strategic partner of the supplying chains in the special steels field.
If you are interested in our products or services, pleased to EMAIL (sales@ccsteels.com) our qualified production engineers or sales department.
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