Definition of cold-rolled steel

Cold-rolled steel refers to various steels made by cold rolling process. Compared with hot rolling process, steel made by cold rolling process has brighter appearance, more precise size and higher strength.

Overview of cold-rolled steel specifications

Size range of cold-rolled steel

  1. Thickness (mm): 0.30-4.00
  2. Width (mm): 600-2050
  3. Length (mm): 1000-6000

Allowable deviation of cold-rolled steel thickness (minimum yield strength less than 280MPa)

Thickness(mm)Thickness tolerance
Normal precision PT. AHigher precision PT.B
Width(mm)Width(mm)
≤1200>1200~1500>1500≤1200＞1200～1500>1500
≤0.40±0.04±0.05±0.06±0.025±0.035±0.045
＞0. 40~0.60±0.05±0.06±0.07±0.035±0.045±0.050
＞0.60~1,80±0.06±0.07±0.08±0.040±0.050±0.050
＞0.80~1.00±0.07±0.08±0.09±0.045±0.060±0.060
＞1.00~1.20±0.08±0.09±0.10±0.055±0.070±0.070
＞1.20~1.60±0.10±0.11±0.11±0.070±0.080±0.080
＞1.60~2.00±0.12±0.13±0.13±0.080±0.090±0.090
＞2.00~2.50±0.14±0.15±0.15±0.100±0.110±0.110
＞2.50~3.00±0.16±0.17±0.17±0.110±0.120±0.120
＞3.00~4.00±0.17±0.19±0.19±0.140±0.150±0.150

Common cold-rolled steel plate grades include

Q195, Q215, Q235, SPCC, SPCD, SPCE, STCEN, ST12, ST13, ST14, ST15, ST16, DC01, DC03, DC04, DC05, DC06, etc.

What are the categories of cold-rolled steel?

Cold-rolled steel can be classified into ordinary carbon structural steel, high-quality carbon structural steel, low-alloy structural steel, cold-rolled stainless steel, low-carbon cold-rolled steel for enamel, etc.

Low-carbon cold-rolled steel

Classification

Classification by useGradeUse
DC01General use
DC03Stamping
DC04For deep drawing
DC05For extra deep drawing
DC06For super deep drawing
DC07For extra super deep drawing

Grade and chemical composition

GradeCMnPSAltTi
DC01≤0.12≤0.60≤0.045≤0.045≥0.020
DC03≤0.10≤0.45≤0.035≤0.035≥0.020
DC04≤0.08≤0140≤0.030≤0.030≥0.020
DC05≤0.06≤0.35≤0.025≤0.025≥0.015
DC06≤0.02≤0.30≤0.020≤0.020≥0.015≤0.30
DC07≤0.01≤0.25≤0.020≤0.020≥0.015≤0.20

Mechanical properties

GradeYield strength/MPaTensile strength/MPaElongation after fracturer90n90
DC01280270-41028
DC03240270-370341.3
DC04210270-350381.60.18
DC05180270-330401.90.2
DC06170270-330412.10.22
DC07150250-310442.50.23

Equivalent standards

GB/T 5213-2008GB/T 5213-2001 GB/T 13237-1991EN 10130-2006JIS G 3141-2005ISO 3574:1999ASTM A 1008M-07
DC0108AIDCO1SPCCCR1CS Type C
DC03DC03SPCDCR2CS Type A,B
DC04SC1DC04SPCECR3DS Type A,B
DC05SC2DCO5SPCFCR4DDS
DC06SC3DC06SPCGCR5EDDS
DC07DC07
Cold rolled galvanized steel
Cold rolled galvanized steel
Cold rolled stainless steel
Cold rolled stainless steel

Cold-rolled stainless steel(CRS)

Size range

ShapeThickness(mm)Width(mm)
Wide steel strip, coiled steel plate≥0.10～<8.00≥600～<2100
Slitting wide steel strip, coiled steel strip≥0.10～≤8.00<600
Narrow steel strip, coiled steel strip≥0.01～≤3.00<600
Wanzhi Cold Rolled Stainless Steel Production Process

Thickness tolerance

Thickness（mm）Thickness tolerance
Width(mm)≤10001000<Width(mm)≤13001300＜Width(mm)≤210
Normal precisionHigher precisionNormal precisionHigher precisionNormal precisionHigher precision
≥0.10～＜0.20±0.025±0.015
≥0.20～＜0.30±0.030±0.020
≥0.30~＜0.50±0.04±0.025±0.045±0.030
≥0.50~＜0.60±0.045±0.030±0.05±0.035
≥0.60～＜0.80±0.05±0.035±0.055±0.040
≥0.80~＜1.00±0.055±0.040±0.06±0.045±0.065±0.50
＞1.00～＜1.20±0.06±0.045±0.07±0.050±0.075±0.55
≥1.20～＜1.50±0.07±0.050±0.08±0.055±0.09±0.60
≥1.50～＜2.00±0.08±0.055±0.09±0.060±0.10±0.70
≥2.00~＜2.50±0.09±0.10±0.11
≥2.50～＜3.00±0.11±0.12±0.12
≥3.00～＜4.00±0.13±0.14±0.14
≥4.00～＜5.00±0.14±0.15士0.15
≥5.00～＜6.50±0.15±0.16±0.16
≥6.50～＜8.00±0.16±0.17±0.17
Thickness（mm）Thickness tolerance
Width(mm)＜125125≤Width(mm)＜250250≤Width(mm)＜600
Normal precisionHigher precisionNormal precisionHigher precisionNormal precisionHigher precision
≥0.05～＜0.10±0.10t±0.06t±0.12t±0.10t±0.15t±0.10t
≥0.10～＜0.20±0.010±0.008±0.015±0.012±0.020±0.015
≥0.20～＜0.30±0.015±0.012±0.020±0.015±0.025±0.020
≥0.30～＜0.40±0.020±0.015±0.025±0.020±0.030±0.025
≥0.40～＜0.60±0.025±0.020±0.030±0.025±0.035±0.030
≥0.60～＜1.00±0.030±0.025±0.035±0.030±0.040±0.035
≥1.00～＜1.50±0.035±0.030±0.040±0.035±0.045±0.040
≥1.50～＜2.00±0.040±0.035±0.050±0.040±0.060±0.050
≥2.00～＜2.50±0.050±0.040±0.060±0.050±0.070±0.060
≥2.50～≤3.00±0.060±0.050±0.070±0.060±0.080±0.070

Ordinary carbon structural cold-rolled thin steel plate

Grade and chemical composition

GradeChemical composition (mass fraction)/%≤
CSiMnPS
Q1950.120.30.50.0350.035
Q2150.150.351.20.0350.035
Q2350. 220. 351.40.0350.035
Q2750.240.351.50.0350.035

Mechanical properties

GradeYield strength/MPaTensile strength/MPaElongation after fracture/%
Q195≥195315~430≥26≥24
Q215≥215335~450≥24≥22
Q235≥235370~500≥22≥20
Q275≥275410~540≥20≥18

Cold-rolled steel coil production process

The production process of cold-rolled steel coil mainly includes: pickling → cold rolling → degreasing → annealing → leveling → shearing (cross-cutting, longitudinal cutting)

Cold-rolled steel coil production process
Cold rolled steel coil annealing process

Properties of cold-rolled steel

  • High hardness and strength: Cold-rolled steel is rolled at room temperature, and has higher hardness and strength than hot-rolled steel.
  • Excellent processing performance: Cold-rolled steel has good plasticity and formability, and can be processed by stamping, cold cutting, bending, etc.
  • Good surface quality: Cold-rolled steel has been rolled and stretched many times, making the surface glossy, without defects such as scale, pitting, rust, etc.
  • Accurate size: The thickness and dimensional accuracy of cold-rolled steel are usually higher than those of hot-rolled steel, and the thickness difference is generally no more than 0.01-0.03mm or less, which can fully meet the requirements of high-precision tolerances.
  • Toughness and weldability: The toughness and weldability of cold-rolled steel are relatively poor. It should be noted that cracks should be avoided during processing.

Applications of cold-rolled steel

Due to the good surface quality and precise size of cold-rolled steel, it is widely used in projects requiring high gloss and high precision. Typical applications include:

  • Automobile manufacturing: automobile body, door, roof, wheel, chassis and other parts.
  • Construction: building structures, industrial plants, warehouses, wall panels, roof panels, bridges, pipes, stairs, guardrails, etc.
  • Home appliances: refrigerators, washing machines, air conditioners, microwave ovens and other home appliance shells and internal components.
  • Packaging: food packaging, beverage packaging, cosmetics packaging, etc.
  • Aerospace structures: aircraft parts and structural parts, aircraft engine parts and spacecraft shells, etc.
  • Machinery manufacturing: commonly used in the manufacture of mechanical equipment, parts, tools, etc. in the machinery manufacturing field.

Conclusion

The cold-rolled steel supplied by Wanzhi Steel includes cold-rolled steel rolled on the basis of hot-rolled steel, and cold-rolled products processed by coil coating equipment, with metal materials or organic coatings on the surface of cold-rolled products.

  • Coated cold-rolled products include galvanized steel, aluminum-zinc-coated steel, electro-galvanized steel, hot-dip galvanized steel, and electro-tinned (tinplate);
  • Color-coated cold-rolled products include ppgi and ppgl.

If you have procurement needs for the above cold-rolled steel, please contact Wanzhi Steel.

This is our website: https://wanzhi-steel.com/

WhatsApp: +8615138685087

Email: info02@wanzhisteel.com

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