20CrMoA
2026-07-25 09:00:50 Origin： Remark：0 Click：
DL/T 439 technical guide for high-temperature bolt of fossil-fired power plant 20CrMoA alloy structure steel stock available round bar, flat bar, hollow bar 20CrMoA forgings
TECHNICAL DATA SHEET - 20CrMoA
MATERIAL TYPE: technical guide for high-temperature bolt of fossil-fired power plant
MATERIAL TYPE: technical guide for high-temperature bolt of fossil-fired power plant
MATERIAL SPECIFICATIONS: DL/T 439 - 2018.
APPLICATION TEMPERATURE (℃): 400 max.
PRODUCT DESCRIPTION
20CrMoA 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。
Final heat treatment - quenched and tempered.
Stock available: round bar diam. 20 ~ 270 mm, plate, flat bar, forging block.
PROFILES AND DIMENSIONS
Rod & round bar & disc: Diam.6.0 ~ 950 mm
Square bar & flat bar: T10 ~ 300 X W 15 ~ 600 X L mm
Length: random length or based on the customer's special requirement.
Plate & Sheet steel: T 0.5 ~ 300 X W 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.
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 ~ 0.24
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.40 ~ 0.70
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.030
Rod & round bar & disc: Diam.6.0 ~ 950 mm
Square bar & flat bar: T10 ~ 300 X W 15 ~ 600 X L mm
Length: random length or based on the customer's special requirement.
Plate & Sheet steel: T 0.5 ~ 300 X W 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.
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 ~ 0.24
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.40 ~ 0.70
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.030
Nickel, Ni (%): ≤ 0.30
Chromium, Cr (％): 0.80 ~ 1.10
Chromium, Cr (％): 0.80 ~ 1.10
Molybdenum, Mo (％): 0.15 ~ 0.25
Tungsten, W (%): -
Vanadium, V (％): -
Niobium, Nb (%): -
Vanadium, V (％): -
Niobium, Nb (%): -
Titanium, Ti (%): -
Aluminum, Al (%): -
Ferrum, Fe (%): balance.
HEAT TREATMENT PRACTICE - MECHANICAL PROPERTIES AT RM.
Heat treatment temperature / ℃ | annealing: -.
Heat treatment temperature / ℃ | normalizing: -
Heat treatment temperature / ℃ | quenching: 880 ~ 900 water or oil cooling
Heat treatment temperature / ℃ | tempering : 580 ~ 600 air cooling
Hardness after annealing ≤ HB: -
Tensile strength, Rm ≥ MPa: 637
Yield strength, Rp0.2 ≥ MPa: 490
Elongation, A5 ≥ (%): 14.0
Reduction of area, Z ≥ (%): 40.0
Impact strength, AKu ≥ J: 55
Hardness under heat treatment ≤ HB: 196 ~ 241
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.
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.
JIANGYOU LONGHAI SPECIAL STEEL CO.,LTD
ISO 9001-2015 Certified by UKAS / UICC
Raw material (ESR ingot, round bar, plate) stock available
Custom 450 / XM-25 (S45000), 403 ESR, AISI 616 / 422 ESR / 1.4935, B50A365 / 403Cb
17-4PH / 630, M-152 / 1.4938 / S151D, FV520B / S143 / 1.4594. X22CrMoV12-1
13Х11Н2B2MФ / AE961W, 11Х11Н2B2MФ / 16Х11Н2B2MФ
X8CrMnN18-18, X40MnCrN19, X40MnCr18, X55MnCrN18-4
15-5PH / XM-12 (S15500, 1.4545), A-286 AISI 660 / S66286
10705BU, 10705MBU, 10705AJ, 10705BB/BC, S111, S159
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