Cold rolled close annealed steel coils are made from Hot Rolled Coils. Cold Rolling is a process through which the Hot Rolled steel sheet or strip after Pickling process is introduced between rollers by application of high pressure at temperature below the re-crystallization temperature. This method basically imparts smooth surface finish, accurate thickness, high tensile strength, yield strength hardness with corresponding decrease inductility. Hence selection of proper combination of steel composition, degree of cold working and heat treatment play a pivotal role to produce cold rolled sheets / strips having diverse applications and mechanical properties suitable for a wide spectrum of end users.
Steel House Processes Cold Rolled sheet in a variety of sizes, grades and surface finishes to meet specific end-use requirements. Cold Rolled Sheet is manufactured from hot rolled coils and Pickling to remove the surface oxide produced during the hot rolling stage, and cold reducing through a Cold Mill to the desired thickness.
Cold Roll Steel Sheets
Steel House Processes Cold Rolled sheet in a variety of sizes, grades and surface finishes to meet specific end-use requirements. Cold Rolled Sheet is manufactured from hot rolled coils and Pickling to remove the surface oxide produced during the hot rolling stage, and cold reducing through a Cold Mill to the desired thickness.
Typical uses for Cold Rolled Steel
Metal furniture, desks, filing cabinets, shelves, tables, chairs, motorcycle exhaust pipes, computer cabinet and hardware, all home appliances and components, shelving, lighting fixtures, hinges, tubing, steel drums, lawn mowers, electronic cabinetry, lighting fixtures, water heaters, metal containers, and a variety of construction related products.
Formability
Cold Rolled Steels can be used to produce parts containing simple bends to parts with extreme deep drawing requirements depending on the grade and mechanical properties selected. Cold-rolled sheet metal can be readily welded and is suitable for painting applications when the surface has been well cleaned.
JSW Product Standard
JSW can offer cold rolled strip in soft forming qualities and high-strength qualities.
| Quality | EN 10130 | JIS G3141 | ASTMA 1008 | IS 513 |
|---|---|---|---|---|
| CQ | DC01 | SPCC | CS type A, B & C | O |
| DQ | DC03 | SPCD | DS | D |
| DDQ | DC04 | SPCE | DDS | DD |
| EDDQ | DC05 | SPEN | EDDS | EDD |
| IF | DC06 | - | EDDS+ | - |
| HIF350 | 220Y | SPC340HR | - | - |
| QUALITIES | EN 10268 | JIS G3135 | ASTMA 1008 | IS 513 |
| HSS | H260LA | SPFC 340 | - | - |
| HSS | H300LA | SPFC 390 | - | - |
| HSS | H340LA | - | Grade 50[340] | - |
| HSS | H380LA | SPFC 440 | Grade 55[380] | - |
| HSS | H420LA | SPFC 490 | Grade 60[410] | - |
| Bake Hardening | B180H | SPFC 340H | Grade 26[180] | - |
| Bake Hardening | B220H | - | Grade 31[210] | - |
Mechanical Properties
| Steel Grades | Yield Strength (N/mm2) | Tensile Strength (N/mm2) | %Elongation (GL 80mm) | ||||
|---|---|---|---|---|---|---|---|
| Min. | Max. | Min. | Max. | ||||
| CQ | - | 280 | 270 | 410 | 30 | ||
| DQ | - | 240 | 270 | 370 | 34 | ||
| DDQ | 140 | 210 | 270 | 350 | 38 | ||
| EDDQ | 140 | 180 | 270 | 330 | 40 | ||
| IF | 120 | 160 | 270 | 350 | 44 | ||
| HIF350 | 220 | - | 350 | - | - | ||
| H260LA | 260 | 330 | 350 | 430 | 26 | ||
| H300LA | 300 | 380 | 380 | 480 | 23 | ||
| H340LA | 340 | 420 | 410 | 510 | 21 | ||
| H380LA | 380 | 460 | 440 | 560 | 19 | ||
| H420LA | 420 | 500 | 470 | 590 | 17 | ||
| H180B | 180 | 230 | 300 | 360 | 34 | ||
| H220B | 220 | 270 | 320 | 400 | 32 | ||
Productwise Thickness and Width Limits
| Product | Thickness, mm | Width, mm |
|---|---|---|
| HRPO (HR Pickled and Oiled) | 1.6 – 6.0 | 1270 |
| HRSPO (HR Pickled, Skin Passed and Oiled) | 1.6 – 3.0 | 1270 |
| CRCA (Cold Rolled and Close Annealed) | 0.3 – 3.0 | 1650 |
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