EN 10130 Standard Guide

Cold Rolled Low Carbon Steel Flat Products for Cold Forming – Technical Delivery Conditions

1. Scope

Product Type	Cold rolled uncoated low carbon steel flat products
Minimum Width	600 mm or greater
Thickness Range	Minimum 0.35 mm, Maximum 3 mm (unless otherwise agreed)
Delivery Forms	Sheet, coil, slit coil, or cut lengths
Application	Cold forming operations

2. Steel Grades

Steel Name	Steel Number	Classification	Deoxidation
DC01	1.0330	Non-alloy quality steel	Manufacturer’s discretion
DC03	1.0347	Non-alloy quality steel	Aluminium fully killed
DC04	1.0338	Non-alloy quality steel	Aluminium fully killed
DC05	1.0312	Non-alloy quality steel	Aluminium fully killed
DC06	1.0873	Alloy quality steel	Aluminium fully killed
DC07	1.0898	Alloy quality steel	Aluminium fully killed

3. Chemical Composition (Ladle Analysis, Max %)

Grade	C	Mn	P	S	Ti	Notes
DC01	0.12	0.60	0.045	0.045	–	May contain B or Ti
DC03	0.10	0.45	0.035	0.035	–	May contain B or Ti
DC04	0.08	0.40	0.030	0.030	–	May contain B or Ti
DC05	0.06	0.35	0.025	0.025	–	May contain B or Ti
DC06	0.02	0.25	0.020	0.020	0.3	Ti may be replaced by Nb
DC07	0.01	0.20	0.020	0.020	0.2	Ti may be replaced by Nb

4. Mechanical Properties (Skin-Passed Products)

Note: Properties apply to nominal thickness. Adjustments required for different thicknesses (see notes below tables).

Grade	Re (MPa)	Rm (MPa)	A80 min (%)	r90 min	n90 min
DC01	-/280	270/410	28	–	–
DC03	-/240	270/370	34	1.3	–
DC04	-/210	270/350	38	1.6	0.180
DC05	-/180	270/330	40	1.9	0.200
DC06	-/170	270/330	41	2.1	0.220
DC07	-/150	250/310	44	2.5	0.230

Important Notes on Mechanical Properties:

Re = Yield Strength (0.2% proof strength or lower yield strength ReL)
Rm = Tensile Strength
A80 = Elongation (minimum percentage)
r90 = Plastic strain ratio (applies to thickness ≥ 0.5 mm)
n90 = Tensile strain hardening exponent (applies to thickness ≥ 0.5 mm)
Thickness Adjustments:

– For 0.5 mm < t ≤ 0.7 mm: Re increases by 20 MPa, A80 decreases by 2%

– For t ≤ 0.5 mm: Re increases by 40 MPa, A80 decreases by 4%

– For t > 2 mm: r90 decreases by 0.2

5. Property Validity and Stretcher Strain Marks

Grade	Property Validity	Surface Quality A	Surface Quality B
DC01	Not guaranteed	–	No stretcher marks for 3 months
DC03-DC05	6 months	No stretcher marks for 6 months	No stretcher marks for 6 months
DC06-DC07	6 months	No limit	No limit

6. Surface Quality

Quality	Description
Surface Quality A	Minor defects permitted that do not affect formability or surface coating application. Includes: pores, slight indentations, small marks, minor scratches, and slight coloring.
Surface Quality B	Better surface must be free from defects that might affect: Uniform appearance of quality paintElectrolytic coating Other surface must meet at least Quality A requirements.

Important Notes:

For coil/slit coil delivery, higher percentage of surface defects may occur compared to sheet/cut lengths
Unless otherwise agreed, only one surface needs to meet specified requirements
Surface Quality B is not applicable to non-skin-passed products

7. Surface Finish

Surface Finish	Symbol	Roughness (cut-off: 0.8 mm)
Bright	b	Ra ≤ 0.4 μm
Semi-bright	g	Ra ≤ 0.9 μm
Normal (default)	m	0.6 μm < Ra ≤ 1.9 μm
Rough	r	Ra > 1.6 μm

Notes:

If not specified, products are supplied with normal finish (m)
Roughness measured according to EN 10049
For automotive applications, cut-off value 2.5 mm may also be used
No specific surface finish can be specified for non-skin-passed products

8. Delivery Conditions

8.1 Skin-Passing

Products are normally supplied skin-passed
Non-skin-passed products available by agreement
Skin-passing prevents stretcher strain marks during forming

8.2 Oiling and Corrosion Protection

Products normally delivered oiled (both sides)
Neutral non-drying oil, free of foreign bodies
Corrosion protection guaranteed for 6 months from availability
Oil removable by alkaline solutions or normal solvents
Non-oiled products available on request (higher risk of corrosion and scratches)

8.3 Surface Coating Suitability

Products suitable for metallic coating (hot dipping, electrodeposition)
Suitable for organic and other coatings
Intended coating must be specified at enquiry/order

8.4 Weldability

Products suitable for standard welding processes
Welding process should be specified at enquiry/order (especially for gas welding)

9. Product Designation

The designation consists of:

Product form (sheet, coil, slit coil, or cut length)
Standard reference (EN 10130)
Steel name or number
Surface quality symbol (A or B)
Surface finish symbol (if applicable: b, g, m, or r)

Designation Examples:

Example	Description
Sheet EN 10130-DC01-A-m	Sheet, grade DC01, surface quality A, normal finish
Coil EN 10130-DC06-B-g	Coil, grade DC06, surface quality B, semi-bright finish
Sheet EN 10130-1.0330-A-m	Sheet, steel number 1.0330 (DC01), surface quality A, normal finish

10. Tolerances on Dimensions and Shape

Tolerances for dimensions and shape are specified in EN 10131.

11. Testing and Inspection

11.1 Inspection Unit

30 tonnes or fraction thereof for products of same grade and nominal thickness
Coils exceeding 30 tonnes constitute a single inspection unit

11.2 Testing Requirements

Tensile test required for each inspection unit
Determination of r and n values where applicable
Tests carried out at ambient temperature in delivery condition
Test pieces perpendicular to rolling direction (when width permits)

11.3 Test Methods

Tensile test: EN 10002-1 (Type 2 test pieces: Lo = 80 mm, width = 20 mm)
Surface roughness: EN 10049
Plastic strain ratio r: ISO 10113
Tensile strain hardening exponent n: ISO 10275
Chemical composition: EN ISO 14284

12. Information Required from Purchaser

The following information must be provided at time of enquiry and order:

Full product designation (as per clause 4)
Nominal dimensions, tolerances, and quantities
Mill edges or trimmed edges
If non-skin-passed delivery required
Mass and size limits for coils/bundles
Intended application including surface coating
Welding method if applicable
If suitable for making specific part
Type of inspection document required (EN 10204)
If external inspection required
If oiling not required
If other protective coatings required
Special requirements for packing and marking
Position of better surface quality (if applicable)

13. Quick Reference – Grade Selection Guide

Grade	Formability	Typical Applications	Key Features
DC01	Basic formability	Simple bending, light forming	Form within 6 weeks
DC03	Good formability	General forming operations	Standard applications
DC04	Very good formability	Complex forming, deep drawing	Automotive parts
DC05	Excellent formability	Very complex deep drawing	Demanding applications
DC06	Superior formability	Extra deep drawing, extreme forming	No stretcher marks
DC07	Highest formability	Most demanding deep drawing	No stretcher marks