75Cr1最早见于DIN 17350-1980（工具钢）中，德国75Cr1材料代号：1.2003，75cr1锯片钢板除有良好的纯净度、组织均匀性及表面质量外，还不同程度地具有较高强度和韧性。75cr1性能优良，热轧状态下，抗拉强度高达1030N/mm2，有些钢材经适当热处理，可分别具有较好的淬透性、耐磨性、耐蚀性、耐热性、耐低温性及红硬性等特殊性能。

以下是一个主机厂发的一些技术标准，我司生产的75Cr1完美匹配，长期供应中。

PURPOSE
This material datasheet describes steel sheet material 75Cr1 in annealed condition since no national
or international norm covers properly KKKK needs. 

SCOPE
Metal activities within KKKK Automotive Seating
TECHNOLOGICAL
all fields
GEOGRAPHICAL
worldwide

RELATED DOCUMENTS
• GB/T 1299 Alloy tool steels
• YB/T 5058 Cold-rolled spring and tool steel strips
• ISO 10474 Steel and steel products – Inspection documents
• ISO 643 Steels micrographic determination of the apparent grain size
• ISO 6892 Metallic Materials testing at ambient temperature
• ISO 4967 Steel determination of content of non-metallic inclusions–Micrographic
• ISO 6507-1 Metallic Materials – Vickers hardness test
• ISO 7438 Metallic materials – Bend test
• ISO 14284 Steel and iron-sampling and preparation of samples for the determination
of chemical composition
• EN 10132-4 Cold-rolled narrow steel strip for heat-treatment, Part 4: Spring steels and
other applications
• EN 10140 Cold rolled narrow steel strip – Tolerances on dimensions and shape
• FST-S-PSX-0028 kkkk specification: standard pictures to spheroidizing rate

1	Description
Material name: Kind of material:	75Cr1 sheet steel, spheroidizing annealed

2 Chemical composition
Chemical composition in weight%

Element	C	Si	Mn	P	S	Cr	Cu	Ni	Mo	N
Min.	0.72	0.2	0.60	0.3	0.01
Max.	0.77	0.35	0.80	0.02	0.008	0.4	0.03	0.08	0.06	0.01

All chemical elements shown in the table must be indicated on the delivery inspection certificate 3-1
according to ISO 10474
3 Delivery conditions

The product must exhibit the defined properties in this datasheet.

Thickness tolerances are specified according to EN10140 unless other agreement between supplier and customer is agreed. Partial decarburization depth accepted is 1% of the strip thickness. Surface roughness

is expected to be Ra max 1.9 µm.

Products must be supplied pickled and oiled. Both sides of the sheet are corrosion protected, free of
impurity and uniformly spread, so that under the normal packing, transportation, loading and storage
conditions, there will be no corrosion for up to three months. Welded coils are forbidden.
4 Material properties
4.1 Material structure
Microstructure morphology: Homogeneous ferrite microstructure with globular carbides
Preferential band structure alignment should be avoided
Grain size: Min Grain size 6 according to ISO 643
Carbide distribution:kkkk specification FST-S-PSX-0028 Pictures C or D
Non-metallic inclusions: According to ISO 4967,acceptance chart diagram

A	B	C	D	DS
Average	0.8	0.25	1.15	1.2	0.3
Max	1.5	0.5	2	1.5	0.5
Cleanliness Index Ci	＜ 5000

4.2 Mechanical properties in longitudinal direction (1)

Tensile strength – TS	510-610 MPa
Yield strength – YS at 0.2	325-475 MPa
Elongation at break – A80	min. 20 %
Elongation at break – A5,65(2)	min. 25 %

(1) All tests acc. to ISO 6892
(2) Additional elongation at break for thickness: min 3mm
4.3 Hardness
Max. 200 HV10
Vickers hardness testing acc. to ISO 6507-1
Surface and core of part
5 Bend test
Bending test acc. to ISO 7438 with 180° folding and bending radius 0.75 x thickness

Testing direction: Expected results:

Longitudinal direction No cracks after bending

The values for the bend test apply to transverse test pieces.