Grade 45
2026-07-22 15:07:46 Origin： Remark：0 Click：
DL/T 439 technical guide for high-temperature bolt of fossil-fired power plant Grade 45 alloy structure steel stock available round bar, flat bar, tube and forgings.
TECHNICAL DATA SHEET - Grade 45
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
Grade 45 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.
Final heat treatment: normalized, quenched and tempered.
Stock available: round bar diam. 20 ~ 210 mm, ingot, billet.
PROFILES AND DIMENSIONS
Rod & round bar & disc (diameter): 6.0 ~ 900 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 ~ 200 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 (％): 0.42 ~ 0.50
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.50 ~ 0.80
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.030
Rod & round bar & disc (diameter): 6.0 ~ 900 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 ~ 200 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 (％): 0.42 ~ 0.50
Silicon, Si (％): 0.17 ~ 0.37
Manganese, Mn (％): 0.50 ~ 0.80
Phosphorus, P (％) ≤: 0.035
Sulfur, S (％) ≤: 0.030
Nickel, Ni (%): ≤ 0.25
Chromium, Cr (％): ≤ 0.25
Chromium, Cr (％): ≤ 0.25
Molybdenum, Mo (％):
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: 840 ~ 860 air cooling
Heat treatment temperature / ℃ | tempering : 580 ~ 630 air cooling
Hardness after annealing ≤ HB: -
Tensile strength, Rm ≥ MPa: 637
Yield strength, Rp0.2 ≥ MPa: 353
Elongation, A5 ≥ (%): 16.0
Reduction of area, Z ≥ (%): 40.0
Impact strength, AKu ≥ J: 39
Hardness under heat treatment ≤ HB: 187 ~ 229
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.
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
JIANGYOU LONGHAI SPECIAL STEEL CO.,LTD
ISO 9001-2015 Certified by UKAS
Total list
Monthly rank
- 10918CrNiMo7
- 52A182 Grade F11 Class 2
- 26S154
- 25AISI / SAE 3145
- 21AISI/SAE 6140
- 2130NiCrMo12
- 2150CrVA
- 17X46Cr13
- 16EN 355
- 1534CrNiMo4