21B3
2015-10-19 20:53:37 Origin： Remark：0 Click：
NF A35-557 French standards structure steel 21B3 Plate, Round bar, Flat bar 21B3 Forgings, Hot rolling, Heat treatment, Ultrasonic test, Cold working or Machined.
Official Test Certificate: issued by TUV - SGS - BV
TECHNICAL SPECIFICATION DATASHEET - Grade NF 21B3
MATERIAL TYPE: High mechanical property of fasteners steel
MATERIAL STANDARDS: NF A35-557
CHEMICAL COMPOSITION (mass weight - %)
Carbon, C (％): 0.18 ~ 0.24
Silicon, Si (％): 0.10 ~ 0.40
Silicon, Si (％): 0.10 ~ 0.40
Manganese, Mn (％): 0.60 ~ 0.90
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.035
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.035
Chromium, Cr (%): -
Nickel, Ni (%): -
Molybdenum, Mo (%): -
Boron, B (％): 0.0008 ~ 0.0050
Boron, B (％): 0.0008 ~ 0.0050
MECHANICAL PROPERTY
Tensile strength σb≥/MPa: 630
Yield strength σs≥/MPa: 515
Elongation δ5 ≥(%): 15
Yield strength σs≥/MPa: 515
Elongation δ5 ≥(%): 15
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 /LF + IFF + 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, or bright annealing specially.
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 rods.
Process plant – fasteners, Mechanical gears, gear shaft, main axis, valve rods.
Mechanical parts - connecting rod, bolt and nut, Multidiameter shafts.
PRODUCT PROFILE
Round bar / Wire rod (Diameter): 5.5mm to 500mm
Square bar / Flat bar: 10mm to 650mm
Length: Fixed length or random length or based on the customer's special requirement.
Round bar / Wire rod (Diameter): 5.5mm to 500mm
Square bar / Flat bar: 10mm to 650mm
Length: Fixed length or random length or based on the customer's special requirement.
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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