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TECHNICAL SPECIFICATION DATASHEET - W-Nr.1.5026
MATERIAL TYPE: Spring Steel
MATERIAL STANDARDS: DIN 17221
CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.52 ~ 0.60
Si (％): 1.60 ~ 2.00
Mn (％): 0.60 ` 0.90
P (％)≤: 0.025
S (％)≤: 0.025
Cr (%): ≤ 0.40
Mo (%): ≤ 0.10
V (%): -
Other(％): Ni ≤ 0.40, Cu + 10Sn +/- 0.60
Range of size/mm|flat bar: 18
Range of size/mm|round bar: -
Mechanical property ≥|σb/MPa: 1470～1670
Mechanical property ≥|σs/MPa: 1080
Mechanical property ≥|δ5(%): 6
Mechanical property ≥|ψ(%): 25
Mechanical property ≥|Akv /J: 14
HOT WORKING & HEAT TREATMENT
Hot working temperature /℃: 1050~850
Thermal forming temperature /℃: 900~830
Heat treatment temperature/℃|annealing /℃: 640～680
Heat treatment temperature/℃|normalizing /℃: 850~880
Heat treatment temperature/℃|quenching /℃: 820～870 Oil
Heat treatment temperature/℃|tempering /℃: 430～500
Hardness after annealing ≤HBW: 235
MAIN FEATURES & PERFORMANCE REQUIREMENTS
Spring steel is specialized in producing the spring and elastic components due to its elasticity under the condition of quenching and tempering. The elasticity of steel depends on its capacity of elastic deformation.
This allows objects made of spring steel to return to their original shape despite significant bending or twisting occurs.
Spriing steel should possess excellent combination property, such as mechanical property (limit of elasticity, ultimate strength, yield ratio), relaxation resistant, fatigue property, hardenability, physical and chemical property (heat resistance,low temperature resistant, antioxidation, corrosion resistance). To meet the above performance requirement, Spring steel has fine metallurgical quality ( high purity, homogeneity), excellent surface quality ( specially on surface defect and decarburization), precise external form and dimensions.
General spring steels are produced in electric furnace, open hearth furnace, oxygen converter,and high quality spring steel of higher quality or special performance can be made in electro slag furnace or vacuum furnace.
Round bar / Wire rod (Diameter): 5.5mm to 800mm
Square bar / Flat bar: 10mm to 800mm
Length: Fixed length or random length or based on the customer's special requirement.
Heavy/middle plate via hot rolled: T60 - 400mm X W100 - 100mm X L1000 ~ 4000mm
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
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