Import 55crsi, 60si2mn, 65mn Oil Tempered Spring Steel — Buy in Bulk from Supplier in China

Tianjin Wei-jun Metal Products Co., Ltd. supplies oil-tempered spring steel in three alloy grades: 55CrSi, 60Si2Mn, and 65Mn. The 55CrSi grade contains approximately 0.52-0.60% carbon, 1.50-1.80% silicon, and 0.60-0.90% chromium, offering elevated tempering resistance and relaxation stability at service temperatures up to 300 °C. The 60Si2Mn variant, conforming to GB/T 1222 and DIN 1.0904 specifications, carries a higher silicon content of 1.50-2.00% with manganese at 0.70-1.00%, delivering superior elastic limit and fatigue life for heavy-duty coil and leaf spring manufacture. The 65Mn grade, with carbon at 0.62-0.70% and manganese at 0.90-1.20%, provides a cost-effective solution for general-purpose springs where extreme fatigue performance is less critical.

All three grades undergo austenitising, quenching in oil, and medium-temperature tempering to achieve the characteristic tempered troostite or tempered sorbite microstructure essential for spring applications. Oil tempering, as opposed to lead patenting or induction hardening, produces a fine, uniform carbide distribution that balances tensile strength against ductility and impact toughness. Typical tensile strength for 60Si2Mn in the oil-tempered condition ranges 1600-1900 MPa, with yield ratio exceeding 0.85 and elongation after fracture of 6-9%. Surface decarburisation is controlled to 0.03 mm maximum depth per EN 13284-2, preserving fatigue initiation resistance at the wire surface where cyclic stresses concentrate.

These grades serve automotive suspension coil springs, stabiliser bars, clutch and valve springs, railway rolling stock suspensions, and heavy machinery recoil mechanisms. 55CrSi dominates European OEM automotive specifications for its resistance to permanent set under thermal cycling. 60Si2Mn remains the standard for Chinese domestic commercial vehicle and agricultural equipment springs. 65Mn finds application in hand tools, fencing, and lower-cycle industrial springs. Buyers should confirm with Tianjin Wei-jun Metal Products Co., Ltd. the exact grade availability, wire diameter range, coil or cut-length supply form, and whether supply is from mill direct or stockholder inventory.

Tianjin Wei-jun Metal Products Co., Ltd. operates from Xiditou Industry Park in Beichen District, Tianjin, with postal code 300408. The company's tier classification is 'imported' and its trust tier is 'harbor', indicating it has completed baseline platform verification steps. The response rate stands at 0.00% with an average response time of 0 hours, which suggests either a newly registered profile or limited active engagement with inbound trade enquiries through this channel. No employee count, annual revenue, year of establishment, or specific production capacity figures are stated in the available profile data.

The listing positions Tianjin Wei-jun as a supplier of industrial-grade oil-tempered spring steel across three standard Chinese alloy grades. The company does not claim ISO certification directly in its profile, though the source description references generic standards. Buyers should independently verify the supplier's mill authorisation, quality management system certificates, and whether Tianjin Wei-jun holds stock or operates as a trading intermediary. The Beichen District location places the firm within Tianjin's established metals processing corridor, with proximity to Tianjin Port for export shipment.