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A cold rolled steel sheet is produced by pickling a hot coil and rolling it uniformly at an appropriated temperature to a thinner thickness. It has excellent surface configuration and superb mechanical properties for use in automobile and electronic appliance production.
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| Classification | KSD 3512 | JIS G3141 | ASTM A1008 | EN10130 |
|---|---|---|---|---|
|
CQ (Commercial Quality) |
SPCC |
SPCC |
CS |
DC01(Fe P01)
|
|
DQ (Drawing Quality) |
SPCD |
SPCD |
DS |
DC03(Fe P03)
|
|
DDQ (Deep Drawing Quality) |
SPCE |
SPCE |
DDS |
DC04(Fe P04) |
|
DDQ-N (StabilizedDeep Drawing Quality) |
SPCEN |
SPCEN |
DDS |
DC04(Fe P04) |
|
EDDQ |
- |
- |
EDDS |
DC05(Fe P05) |
Commercial
Sheet of this quality is for simple bending or moderate forming. Commercial steel sheet can be bent flat upon itself in any direction at room temperature. It has a wide variety of uses, including automotive panels, electrical home appliances, drums, pipes, farm implements, office supplies, building and civil work materials, and as base metal for various coatings.
Drawing
Sheet of this quality has a greater degree of ductility and is more consistent in performance than commercial steel because of higher standards in production, selection and melting of the steel. It is suitable for automotive panels, audio-visual equipment, and heating apparatuses.
Deep Drawing
Sheet of this designation should be used when drawing steel will not provide a sufficient degree of ductility for fabrication of parts with stringent drawing requirements, or applications that require the sheet be free from aging. This quality is produced through special steelmaking and finishing practices. It is suitable for automotive front panels and rear fenders.
Stabilized Deep Drawing
Stabilized deep drawing quality products boast the highest quality in terms of workability. It is suitable for automotive parts that require complicated treatment such as front fenders or wire. As a non-aging deep drawing sheet made with Al-killed, quality is guaranteed against extreme stretching or straining.
Surface Finish
The surface finish of cold-rolled steel sheet is either dull or bright.
Dull Finish
The dull finish is useful in drawing because lubricant oil can be evenly spread over the entire surface, thereby reducing the possibility of friction. The fine grains also help boost paint adherence and extend the steel life span of the steel.
Bright Finish
Bright finish presents high-quality roughness that is optimal for decorative purposes. The sheet surface is rolled with fine polished rolls.
Tensile testing is performed to determine the yield strength, tensile strength, and elongation of steel sheet.
Test Specimen
All types and sizes of test pieces for tension testing are prescribed in the Specifications of KS, JIS, and ASTM. Cold rolled steel sheet, for example, generally uses the specimen collection method indicated in KS B0801. NO.5
Results
Tension test results are used as a basis for determining the workability and formability of steel sheet.
ⓐ Elongation – Greater elongation provides increased workability.
ⓑ Yield Point – A lower yield point gives better shape to the end product.
ⓒ Yield Ratio (yield point/tensile strength) – A lower yield ratio indicates widened differentiation between tensile strength and yield point. Greater difference translates into better work ability.
ⓓ Modulus of Elasticity – The modulus of elasticity is in an inverse relationship with resistance to elastic strain. Lowered resistance indicates a better formed product.
ⓔ n-Value (Modulus of Work Hardening) – This measure is yielded when the stress- strain curve approximates ∂=CE”. Workability is proportionate to the n-value.
ⓐ Elongation – Greater elongation provides increased workability.
ⓑ Yield Point – A lower yield point gives better shape to the end product.
ⓒ Yield Ratio (yield point/tensile strength) – A lower yield ratio indicates widened differentiation between tensile strength and yield point. Greater difference translates into better work ability.
ⓓ Modulus of Elasticity – The modulus of elasticity is in an inverse relationship with resistance to elastic strain. Lowered resistance indicates a better formed product.
ⓔ n-Value (Modulus of Work Hardening) – This measure is yielded when the stress- strain curve approximates ∂=CE”. Workability is proportionate to the n-value.
ⓕ r-Value (Modulus of Plastic Deformation) – Surface shrinkage in the direction of thickness has an inverse relationship with the r-value and the shrinkage in the direction of width is directly proportionate to the r-value. The higher the value, the less susceptible to fracture, hence better draw ability.
Bending Test
The bending test is performed to determine the ductility of steel sheet. The test specimen for cold-rolled steel sheet is designated in KS B 0801 No.3. In the test, the specimen is bent to a specified angle on a mandrel or a specified radius until fracture. The ductility of the sheet is judged by the cracks on the outside of the bent specimen. A cold-rolled sheet specimen is bent 180 degrees.
Hardness of steel sheet is closely related to other properties like strength, wear resistance, and workability. The hardness test is an easy and effective method of identifying various properties of steel sheet. The Rockwell Hardness test is used for measuring the hardness of cold-rolled steel sheet. The test method is described as follows.
Rockwell Hardness Test
Material resistance to indentation is a qualitative indication of its strength. A steel ball or diamond is often used as an indenter. The hardness value is determined by the difference in penetration depth from the application of an initial minor load onto the indenter followed by a major load. The process is repeated twice. The penetration depth on the surface depends on the increase level in pure load, namely, the B-scale and the F-scale. The B-scale uses a 1/16 (1.588 mm) steel ball indenter and the major load is 100kg. The B-scale most accurately measures specimens with the thickness of 0.762mm (0.030 in.) or over. It is preferable to use the F-scale for specimens with a thickness under 0.762mm.
Tensile strength of cold-rolled steel sheet can be measured in various ways. Since tensile strength is developed through a complicated production process, it is difficult to measure the strength.
Note:
1. Sizes indicated in 그래프 사이즈 영역will be subjected to negotiation.
2. Coils are available inside diameter to be 508㎜(20in.) or 610㎜(24in.)
3. Coils are available in weight ranging between 2.5 Tons(5,500 lbs.) are 20 Tons(44,000 lbs.)
| Standard Specification | Applications | Chemical Component | |||||
|---|---|---|---|---|---|---|---|
|
|
C |
Si |
Mn |
P |
S |
||
|
KS D 3512 (JIS G 3141) |
SPCC |
CQ |
≤ 0.15 |
- |
≤ 0.60 |
≤ 0.1 |
≤ 0.05 |
|
SPCD |
DQ |
≤ 0.12 |
- |
≤ 0.50 |
≤ 0.04 |
≤ 0.04
|
|
|
SPCE(N) |
DDQ(Non-Aging) |
≤ 0.10 |
- |
≤ 0.45 |
≤ 0.30 |
≤ 0.03
|
|
|
ASTM A 1008 |
CS |
CQ |
≤ 0.10 |
- |
≤ 0.60 |
≤ 0.030 |
≤ 0.035
|
|
DS |
DQ |
≤ 0.08 |
- |
≤ 0.50 |
≤ 0.020 |
≤ 0.030
|
|
|
DDS |
DDQ(Non-Aging) |
≤ 0.06 |
- |
≤ 0.50 |
≤ 0.020 |
≤ 0.025
|
|
|
EN 10130 |
DC01(Fe P01) |
CQ |
≤ 0.12 |
- |
≤ 0.60 |
≤ 0.045 |
≤ 0.045
|
|
DC03(Fe P03) |
DQ |
≤ 0.10 |
- |
≤ 0.45 |
≤ 0.035 |
≤ 0.035
|
|
|
DC04(Fe P04) |
DDQ(Non-Aging) |
≤ 0.08 |
- |
≤ 0.40 |
≤ 0.030 |
≤ 0.030
|
|
|
DC05(Fe P05) |
EDDQ |
≤ 0.06 |
- |
≤ 0.35 |
≤ 0.025 |
≤ 0.025
|
|
cold-rolled sheet and coil is packed to withstand handling during transportation and long-distance shipping. Special care is taken to prevent abrasion, rusting and scratching. Our packing procedure is illustrated below. The unit weight per package is usually between 2 and 5 tons for sheet and between 4 and 20 tons for coil.
Inside Diameter is 508mm (20 in)
* Coil width is the same as that of the cold-rolled strip.
* The coil lamination factor is assumed to be 100%.
