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/A Practical Insider’s Guide to the Temper Rolling Mill Walk any modern coil-processing line and you’ll hear the quiet confidence of a well-tuned temper stand. To be honest, mills that looked “good enough” a decade ago are now being pushed to deliver tighter Ra windows, flatter strip, and predictable elongation for tough formers. That’s where a Temper Rolling Mill earns its keep—eliminating yield terraces, improving deep draw ability, cleaning or texturing surfaces, and, with soft reduction, nudging thickness and mechanical properties right where production wants them. What’s driving demand (and upgrades) Automotive AHSS, appliance-grade skin quality, and packaging steels all demand consistent elongation and surface topography. The trend is clear: higher rolling forces in compact 4-high stands, smarter AGC/AFC, and hybrid setups that combine temper pass with tension leveling. Many customers say real-world yield point elongation control is the difference between a trouble-free press room and a pile of scrap. Process flow in the line Materials : Low carbon CR/HR pickled, IF, HSLA, mild tinplate stock—typically 0.2–3.0 mm. Entry : Payoff + weld + entry looper, basic alkaline cleaning (optional solvent spray for oil-heavy strip). Temper stand : 4-high, work roll roughness set for target Ra/Rz; elongation ≈ 0.3–2.0% (grade dependent). Soft reduction : Fine thickness trim and property tuning under controlled tension. Optional : Tension leveler for I-unit flatness control; electrostatic oiler or dry pass, depending on next process. Inspection & testing : On-line flatness meters, off-line tensile (ISO 6892-1/ASTM A370), surface Ra (ISO 4287), visual per EN 10131. Recoiler : Tight, telescoping-free coils with wrap control. Representative specs (Temper Mill) Stand type 4-high, hydraulic AGC/AFC Strip width 600–1,650 mm (custom up to ≈1,850 mm) Thickness range 0.20–3.00 mm (grade dependent) Line speed ≈ 200–800 m/min (real-world use may vary) Rolling force Up to around 1,200–1,800 t Elongation control 0.3–2.0% with closed-loop feedback Surface roughness Ra ≈ 0.3–2.5 μm via roll texturing Certifications ISO 9001, ISO 14001; CE-ready controls Industries and use cases Automotive exposed panels (no stretcher-strain marks), appliance skins, construction sheet, packaging tinplate, and HVAC coil. A Temper Rolling Mill also shines when upstream annealing leaves slight yield point elongation or when surface Ra must be dialed-in for paint adhesion. Vendor snapshot (market view) Vendor Max width (≈) Automation Local service Lead time Price band YWLX (Beijing) 1,850 mm AGC/AFC, MES hooks Asia/EMEA partners ≈ 6–10 months $$ (competitive) SMS group 2,050 mm Tier-1 automation Global ≈ 10–16 months $$$ Primetals 2,000 mm Advanced control suite Global ≈ 9–15 months $$$ Danieli 1,900 mm Integrated line options Global ≈ 8–14 months $$$ Note: figures are indicative; real-world use may vary by project scope. Service life and upkeep Work rolls typically last 6–12 weeks between regrinds (grade/roughness dependent). Back-up bearings often exceed 30,000–50,000 hours with correct filtration. Calibration: quarterly flatness meter and load-cell checks; annual RA master comparison per ISO 4287/4288. Many plants log fewer press complaints after scheduling a 2–3 week pass schedule for roll texture refresh. Quick case note A mid-size appliance maker switched to a Temper Rolling Mill with tension leveling. Yield point elongation artifacts dropped from 1.2% to Customization & support From Beijing (No.1518, LAR Valley Int’l, Guang’anmen Avenue, Xicheng District, 100055), YWLX configures roll texturing (EDT/shot), oiling options, and MES/ERP tags. Testing packages cover ISO 6892-1 tensile, ASTM A568 general requirements, and EN 10131 flatness classes. Authoritative references ASTM A568/A568M — General Requirements for Steel Sheet ISO 6892-1 — Metallic Materials, Tensile Testing ISO 4287 — Surface Texture: Profile Method EN 10131 — Cold Rolled Uncoated Low Carbon Steel Flat Products worldsteel — Flat products overview