Quality	Material-No.	Standard	Surface refinement	Classification according to EN10020
DC01	1.0330	DIN EN 10130	+ZE according to DIN EN 10152	Unalloyed quality steel	Details
DC03	1.0347	DIN EN 10130	+ZE according to DIN EN 10152	Unalloyed quality steel	Details
DC04	1.0338	DIN EN 10130	+ZE according to DIN EN 10152	Unalloyed quality steel	Details
DC05	1.0312	DIN EN 10130	+ZE according to DIN EN 10152	Unalloyed quality steel	Details
DC06	1.0873	DIN EN 10130	+ZE according to DIN EN 10152	Alloyed quality steel	Details
DC07	1.0989	DIN EN 10130	+ZE according to DIN EN 10152	Alloyed quality steel	Details

Cold-rolled flat steel products play a central role in the modern manufacturing industry, especially in the field of cold forming. To ensure the quality and consistency of these products, specific standards are of crucial importance. The standards DIN EN 10130 and DIN EN 10152 define the requirements for these products and provide a framework for their manufacture and use. The grades within these standards are classified according to the maximum permissible yield strength and can be subdivided as follows.

The DIN EN 10130 standard specifies the technical delivery conditions for cold-rolled flat products made of unalloyed quality steels that are primarily intended for the cold forming process.

Technical delivery conditions
DIN EN 10130 comprehensively describes the technical delivery conditions for cold-rolled flat products. These include the chemical composition, mechanical properties and surface quality of the products. Compliance with these conditions ensures that the products meet the desired requirements and specifications.

Chemical composition
The chemical composition is a decisive factor for the properties of the steel. According to DIN EN 10130, the carbon content for quality steels such as DC01 must not exceed 0.12%. In addition, the manganese and phosphorus contents are strictly regulated. This precise composition ensures high cold formability and optimum surface quality.

Mechanical properties
The mechanical properties of products manufactured in accordance with DIN EN 10130 are optimized for the cold forming process. DC01, for example, has a minimum tensile strength of 270-410 MPa and a minimum elongation of 28%. These properties allow the material to be processed effectively without breaking or cracking.

The surface quality of cold-rolled flat products is another important aspect of DIN EN 10130. The standard defines various surface finishes, such as smooth or matt, to meet the specific requirements of the end applications. A high surface quality is crucial for subsequent coating processes or decorative applications.

Surface type A
Defects such as pores, small grooves, small warts, slight scratches and slight discoloration that do not impair the suitability for forming and the adhesion of surface coatings are permissible.

Surface type B
The better side must be free of defects to the extent that the uniform appearance of a quality coating or an electrolytically applied coating is not impaired. The other side must at least meet the requirements for surface type A.

Surface finish	Identification	Center roughness value (limit wavelength: 0,80mm)
Extra smooth	b	Ra ≤ 0,40 µm
Smooth	g	Ra ≤ 0,90 µm
Matt	m	0,6 μm < Ra ≤ 1,9 µm
Rough	r	Ra ≤ 1,6 μm

The DIN EN 10152 standard extends the requirements of DIN EN 10130 to include specific conditions for electrolytically galvanized, cold-rolled flat products. These products offer additional corrosion protection and are widely used in various industrial applications.

Technical delivery conditions
DIN EN 10152 specifies the technical delivery conditions for electrolytically galvanized, cold-rolled flat products. In addition to the chemical composition and mechanical properties, these conditions also include the requirements for the zinc coating.

Chemical composition and zinc coating
The basic composition of the steel remains largely unchanged, but an electrolytic zinc coating is applied to increase corrosion protection. The thickness and uniformity of the zinc coating are precisely defined by the standard in order to ensure optimum protection.

Mechanical properties
The mechanical properties of the galvanized steel largely correspond to those of the base material in accordance with DIN EN 10130. The cold formability and strength are retained despite the additional coating, which expands the application possibilities.

Corrosion resistance and surface quality
A key advantage of products manufactured in accordance with DIN EN 10152 is their improved corrosion resistance. Electrolytic galvanizing effectively protects the steel against rust and extends the service life of the end product. The surface quality can also vary here and is offered in different finishes to meet specific requirements.

Code letters	Type of surface treatment
O	Oiled
P	Phosphated
PC	Phosphated and chemically passivated
C	Chemically passivated
PCO	Phosphated, chemically passivated and oiled
CO	Chemically passivated and oiled
PO	Phosphated and oiled
U	Without surface treatment

Designation	Nominal print run per page Thickness µm	Nominal circulation per page Mass g/m²	Minimum value of the overlay Thickness µm	Minimum value of the print run Mass g/m²
ZE 100/0	10,0/0	72/0	9,1/0	65/0
ZE 100/100	10/10	72/72	9,1/9,1	65/65
ZE 25/0	2,5/0	18/0	1,7/0	12/0
ZE 25/25	2,5/2,5	18/18	1,7/1,7	12/12
ZE 50/0	5/0	36/0	4,1/0	29/0
ZE 50/25	5/2,5	36/18	4,1/1,7	29/12
ZE 50/50	5/5	36/36	4,1/4,1	29/29
ZE 75/0	7,5/0	54/0	6,60/0	47/0
ZE 75/25	7,5/2,5	54/18	6,6/1,7	47/12
ZE 75/50	7,5/5	54/36	6,6/4,1	47/29

Cold-rolled flat steel products manufactured in accordance with the DIN EN 10130 and DIN EN 10152 standards offer a wide range of benefits for cold forming. DIN EN 10130 defines the basic requirements for chemical composition, mechanical properties and surface quality, while DIN EN 10152 adds specific conditions for electrolytically galvanized products that provide additional corrosion protection. Together, these standards ensure that the products are of high quality and durability and can be used in a wide range of industrial applications.