JIS SUP7 steel stockholders and China suppliers. Otai Special Steel have more 16 years experience in jis SUP7 Spring Steel round bar, flat bar., rod bar, wire and plate supply.

JIS SUP7 Steel is a high quality Alloy Spring Steel, It belong to the high quality high carbon alloy Spring Steel. Quenched & Tempered Hardness is 28-34 HRc. SUP7 steel Annealing delivery hardenss less than 250HB.

steel bar

Related Specifications ASTM A29/A29M DIN EN 10083/3 JIS G4053 GB GB/T 3077

Form of Supply

JIS SUP7 Spring Steel China Supplier and Stocker, Otai Special Steel can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. AISI SUP7 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. SUP7 steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground Spring Steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Chemical composition

C(％) 0.56-0.64 Si(％) 1.80-2.20 Mn(％) 0.70-1.00 P(％) ≤0.035
S(％) ≤0.035

Equivalent Of SUP7 alloy Spring Steel

USA Germany China Japan France England Italy Poland ISO Korea Sweden Spain
AISI/SAE/ASTM/UNS DIN,WNr GB JIS AFNOR BS UNI PN ISO KS SS UNE
SUP7 SPS4

Heat treatment Related

  • Annealing of SUP7 Spring Steel

Slowly heated to 740-770 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The SUP7 tool  steel will get MAX 250 HB （Brinell hardness）.

  • Hardening of SUP7 Spring Steel

SUP7 steels should be heated uniformly to 830-860°C (1526-1580°F) until completely heated through. About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil. Get Hardness 61 Min.

  • Tempering of SUP7 Spring Steel

Tempering of SUP7 steels is performed at 480-530°C, Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness. Hardness values at different temperatures after tempering HRC: 150°C-61HRc,200°C-60HRC,300°C-56HRC,400°C-51HRC,500°C-43HRC,550°C-38HRC,600°C-33HRC,650°C-29HRC.

Mechanical Properties

The mechanical properties of SUP7 Spring Steels are outlined in the following table.

Tensile strength Conditions to yield strength Elongation Reduction of area Hardness (Hot Rolled) Hardness (Cold Drawn)
σb (MPa)：≥1274(130) σ0.2 (MPa)：≥1176(120) δ10 (%)：≥5 ψ (%)：≥25 ≤321HB;

Applications

SUP7 steels, Highlight the advantage is good hardenability, another hot working performance, comprehensive mechanical properties,

Decarburization resistance is also good big cross section of various important spring, such as automobile, locomotive, large plate spring, spring, etc. SUP7 Spring main used for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring.

Regular size and Tolerance

Steel round bar: Diameter Ø 5mm – 3000mm

Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm

Steel Hexagonal bar: Hex 5mm – 105mm

Others SUP7 have not specified size, pls contact our experienced sales team.

Processing

JIS SUP7 Spring Steel round bar and flat sections can be cut to your required sizes. SUP7 Spring Steel ground bar can also be supplied, providing a high quality Spring Steel precision ground Spring Steel bar to your required tolerances. JIS SUP7 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Contact our experienced sales team to help you with your SUP7 Spring Steel questions and enquiry by Email or Telephone. The questions will be reply in 24 hours.

OTAI SPECIAL STEEL CO., LTD

Email: jack@otaisteel.com   TEL: 0086-769-33232622   FAX: 0086-769-88705839