GJB 38CrMoAl
2025-06-11 12:35:59 Origin： Remark：0 Click：
GJB 1220A Material Specification for Alloy Structure Steel Bar for Artillery Parts 38CrMoAl Available Round bar, Flat bar 38CrMoAl Forgings
MATERIAL DESIGNATION - GJB 38CrMoAl
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
MATERIAL SPECIFICATIONS - GJB 1220A - 2008.
PRODUCT DESCRIPTION
Alloy 38CrMoAl 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. 15 ~ 200 mm, Plate
PRODUCT PROFILE & DIMENSIONS
Rod & round bar & disc (diameter): 5.5 ~ 820mm
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 - 1000mm 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 ELEMENTS (mass weight %)
Carbon, C (％): 0.35 ~ 0.42
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.020
Chromium, Cr (％): 1.35 ~ 1.65
Nickel, Ni (%): ≤ 0.30
Molybdenum, Mo (％): 0.15 ~ 0.25
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): 0.70 ~ 1.10
Ferrum, Fe (%): balance.
Rod & round bar & disc (diameter): 5.5 ~ 820mm
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 - 1000mm 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 ELEMENTS (mass weight %)
Carbon, C (％): 0.35 ~ 0.42
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.30 ~ 0.60
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.020
Chromium, Cr (％): 1.35 ~ 1.65
Nickel, Ni (%): ≤ 0.30
Molybdenum, Mo (％): 0.15 ~ 0.25
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): 0.70 ~ 1.10
Ferrum, Fe (%): balance.
HEAT TREATMENT PRACTICE - MECHANICAL PROPERTIES AT RM.
Heat treatment temperature /℃ | annealing: -.
Heat treatment temperature /℃ | Normalizing: -
Heat treatment temperature /℃ | Quenching: 940 oil cool
Heat treatment temperature /℃ | Tempering : 640 water / air.
Hardness after annealing ≤ HBW: 229
Tensile strength, Rm ≥ MPa: 980
Yield strength, Rp0.2 ≥ MPa: 835
Elongation, A ≥ (%): 14.0
Reduction of area, Z ≥ (%): 50.0
Impact strength, AKu ≥ J: 71
TECHNICAL SALES ASSISTANCE & SERVICE
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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