40Si7
2025-06-08 16:22:00 Origin： Remark：0 Click：
NF A36-571 Technical specification Spring steel 40Si7 Rod, round bar, sheet, strip Blooming,40Si7 Forging, Hot rolling, Heat treatment, Cold working
Official Test Certificate: issued by TUV - SGS - BV
TECHNICAL DATA SHEET - NF 40Si7
MATERIAL TYPE: Spring steel
MATERIAL STANDARDS: NF A36-571
CHEMICAL COMPOSITIONS (mass weight %)
Carbon, C (％): 0.35 ~ 0.42
Silicon, Si (％): 1.50 ~ 1.80
Silicon, Si (％): 1.50 ~ 1.80
Manganese, Mn (％): 0.50 ~ 0.80
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.025
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.025
Chromium, Cr (%): -
Molybdenum, Mo (%): -
Ferrum, Fe (％): balance
MECHANICAL PROPERTY
Tensile strength, σb ≥ MPa: 1180~1370
Yield strength, σs ≥ MPa: 1030
Yield strength, σs ≥ MPa: 1030
Elongation, δ5 ≥ (%): 6.0
Reduction of area, ψ (％) ≥: -
PRODUCT DESCRIPTION
PRODUCT DESCRIPTION
Alloy structural steel is provided with higher yield strength, tensile strength, endurance strength, yield ratio (about 0.85 generally ) enough plasticity and toughness.
The concentration of alloy element of this kind of steel is quite high, mainly are corrosion resistant steel, heat resistant steel, wear resistant steel, and other special steels of physical and chemical properties. Alloy structural steel has preferable mechanical property than that of carbon structural steel, high performance of heat treatment especially.
The alloy is usually produced by EAF + VD 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 - quechend and tempered.
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
Process plant – fasteners
Mechanical gears, gear shaft, main axis, valve rods
Mechanical parts - connecting rod, bolt and nut
Multidiameter shafts
PRODUCT PROFILE
Rod / round bar (diameter): 5.50mm to 300mm
Square bar / flat bar: 8mm to 600mm
Length: random length or based on the customer's special requirement.
Rod / round bar (diameter): 5.50mm to 300mm
Square bar / flat bar: 8mm to 600mm
Length: random length or based on the customer's special requirement.
Heavy / middle plate via hot rolled: T6 - 200mm X W10 - 1200mm X L1000 - 12000mm
Sheet steel via cold rolled: T0.5 - 6mm X W60 - 1000mm X L1000 - 2000mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 200mm X L (or in coil form)
Sheet steel via cold rolled: T0.5 - 6mm X W60 - 1000mm X L1000 - 2000mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 200mm X L (or in coil form)
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers.
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers.
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