20Cr
2024-04-13 08:57:05 Origin： Remark：0 Click：
GJB 1220A Material Specification for Alloy Structure Steel Bar for Artillery Parts 20Cr Stock Available Round bar, Flat bar, Tube 20Cr Forgings Processing
MATERIAL DATASHEET - GB 20Cr
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
PRODUCT DESCRIPTION
The alloy is usually produced by EAF + VD + LF 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.
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 ~ 320mm
MATERIAL CATEGORY - Specification for Alloy Structure Steel Bar for Artillery Parts,
PRODUCT DESCRIPTION
The alloy is usually produced by EAF + VD + LF 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.
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 ~ 320mm
MATERIAL SPECIFICATIONS - GJB 1220A - 2008
CHEMICAL COMPOSITION (mass weight - %)
Carbon, C (％): 0.18 ~ 0.23
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.50 ~ 0.80
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.020
Chromium, Cr (％): 0.70 ~ 1.00
Nickel, Ni (%): ≤ 0.30
Molybdenum, Mo (％): -
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): -
Titanium, Ti (%): -
Ferrum, Fe (%): balance
Molybdenum, Mo (％): -
Vanadium, V (％): -
Tungsten, W (%): -
Aluminum, Al (%): -
Titanium, Ti (%): -
Ferrum, Fe (%): balance
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Heat treatment temperature /℃| annealing: 690 ~ 710 air cooling.
Heat treatment temperature /℃| Normalizing: -
Heat treatment temperature /℃| Quenching: 880 water
Heat treatment temperature /℃| Tempering : 200 air
Hardness after annealing ≤HBW: 179 Max.
Tensile strength, Rm ≥ MPa: 835
Yield strength, Rp0.2 ≥ MPa: 540
Elongation, A ≥ (%): 10.0
Reduction of area, Z ≥ (%): 40.0
Impact strength, AKu ≥ J: 45
PRODUCT PROFILE & DIMENSIONS
Round bar & Disc (diameter): 5.5mm to 1100mm
Square bar / Flat bar: 8mm to 600mm
Length: Fixed length or random length or based on the customer's special requirement.
Sheet steel via cold rolled: T0.5 - 6mm X W60 - 1000mm X L1000 - 2000mm
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.
TECHNICAL SALES ASSISTANCE
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 meet further on any technical enquiry, pleased to email or call our resident team of qualified production engineers,
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