High tensile steel 40CrNi2Si2MoV & 300M
2026-08-10 10:35:37 Origin： Remark：0 Click：
GJB 5063 Specification for ultra-high strength steel bars for aviation and aerospace 40CrNi2Si2MoV & 300M alloy steel round bar, plate ESR 40CrNi2Si2MoV & 300M remelting process, hot forged, rolled, heat treated
TECHNICAL DATA SHEET - 40CrNi2Si2MoV & 300M
Range of application: ultra-high strength steel bars for aviation and aerospace
Stock available: round bar
PROFILES AND DIMENSIONS
Rod & round bar & disc (diameter): 6.0 ~ 800 mm
Square bar & flat bar: 10 ~ 600 mm
Forging: T15 ~ 500 X W 50 ~ 800 X L mm
TYPICAL CHEMICAL ELEMENTS (mass weight - %)
Carbon, C (％): 0.38 ~ 0.43
Silicon, Si (％): 1.45 ~ 1.80
Manganese, Mn (％): 0.60 ~ 0.90
Phosphorus, P (％): ≤ 0.010
Sulfur, S (％): ≤ 0.010
Chromium, Cr (％): 0.70 ~ 0.95
Nickel, Ni (%): 1.65 ~ 2.00
Molybdenum, Mo (％): 0.30 ~ 0.50
Tungsten, W (%): -
Copper, Cu (%): ≤ 0.35
Aluminum, Al (%): -
Vanadium, V (％): 0.05 ~ 0.10
Ferrum, Fe (%): balance.
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT
Heat treatment temperature / ℃ | annealing: -.
Heat treatment temperature / ℃ | normalizing: 925, air cooled
Heat treatment temperature / ℃ | quenching: 870, oil cooled
Heat treatment temperature / ℃ | tempering : 300, air cooled
Hardness after annealing, ≤ HB: 241
Tensile strength, Rm ≥ MPa: 1860
Yield strength, Rp0.2 ≥ MPa: 1515
Elongation, A5 ≥ (%): 8.0
Reduction of area, Z ≥ (%): 30.0
Impact strength, AKv ≥ J: 39
Hardness after final heat treatment / HB: -
TYPICAL APPLICATIONS
Mechanical parts - connecting rod, bolt and nuts.
Multi-diameter shaft, pressure vessel parts.
Power generation – turbine fasteners – boiler support rods.
Process plant – fasteners, mechanical gears, gear shaft, main axis, valve rod.
PRODUCT DESCRIPTION
300M is usually produced by VIM (vacuum induction furnace) 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 black in the annealed condition.
Final heat treatment - normalized + quenched + tempered.
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.
JIANGYOU LONGHAI SPECIAL STEEL CO.,LTD
ISO 9001-2015 Certified by UKAS, UICC
Raw material stock
Custom 450 / GD450 / XM-25 (S45000), 403 ESR, AISI 616 / 422 ESR, B50A365 / 403Cb+
17-4PH / 630, M-152 / 1.4938 / S151D, FV520B / S143 / 1.4594. X22CrMoV12-1
13Х11Н2B2MФ / AE961W, 11Х11Н2B2MФ / 16Х11Н2B2MФ
AISI 615 / S41800, 15-5PH / XM-12 (S15500), A-286 AISI 660 / S66286
10705BU, 10705MBU, 10705AJ, S132, S131, S111, S159, S154
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