Precision steel strip manufacturing follows three major standard systems: Chinese GB standard, European EN standard, and American SAE/AISI standard. Different grade steel strips correspond to exclusive standard specifications, covering chemical composition, dimensional tolerance, surface quality, mechanical properties, and heat treatment requirements.

For cross-border procurement and international manufacturing cooperation, it is crucial to clarify the standard attributes of 65Mn, C75, CK75, 1075, and C100S steel strips. This blog sorts out the authoritative production standards of all grades for global buyers and manufacturers.

1. 65Mn Steel Strip (Chinese Core Standard)

Exclusive Standard: GB/T 1222-2021 (Chinese Spring Steel Standard), GB/T 3279-2019 (Hot Rolled Steel Strip), GB/T 11253-2019 (Cold Rolled Precision Steel Strip)

65Mn is a unique Chinese standard spring steel grade with no fully equivalent European or American standard grade. The standard strictly defines its carbon content (0.62%–0.70%), manganese content (0.90%–1.20%), and impurity element limits.

All production processes including cold rolling, annealing, quenching and tempering comply with national GB standards, with stable dimensional tolerance and mechanical performance.

It is widely recognized in Southeast Asian, Middle Eastern, and African markets for its standard compliance and cost advantages, and can be customized for export non-standard sizes according to international customer requirements.

2. C75 & CK75 Precision Steel Strip (European EN Standard)

Exclusive Standard: EN 10132-4:2000 (European Standard for Cold Rolled High Carbon Steel Strip for Heat Treatment)

Both C75 and CK75 belong to European standard high-carbon precision steel strips, with unified EN10132-4 production specifications.

The standard clearly distinguishes the two grades: C75 is a conventional grade with basic tolerance and surface requirements, while CK75 is a precision grade with stricter chemical composition control, lower surface defect rate, and higher dimensional accuracy (tolerance ±0.005mm).

Their carbon content is controlled at 0.70%–0.80%, with ultra-low sulfur and phosphorus impurities, meeting EU industrial precision manufacturing and environmental protection standards. They are the mainstream designated materials for European automotive, mechanical, and hardware industries.

3. 1075 Precision Steel Strip (American SAE/AISI Standard)

Exclusive Standard: SAE J403, AISI 1075, ASTM A684 (American High Carbon Cold Rolled Steel Strip Standard)

1075 steel strip is a classic grade of American standard high-carbon steel, fully compliant with ASTM and SAE industry specifications. Its carbon content is 0.70%–0.80%, matching the carbon content of European C75/CK75, but it adopts American rolling process and mechanical property testing standards.

The standard focuses on the processability and edge quality of the steel strip, with strict requirements for stamping and cutting performance. It is the preferred standard material for North American machinery, tools, and automotive accessory manufacturing, and is widely accepted in American and Canadian industrial supply chains.

4. C100S Precision Steel Strip (High-Grade European EN Standard)

Exclusive Standard: EN 10132-4:2000, DIN 17222 (German Industrial Standard)

C100S is a high-end high-carbon precision steel strip under European DIN and EN standards, with carbon content up to 0.95%–1.05%. The standard puts forward ultra-high requirements for material uniformity, surface finish, and heat treatment stability. It is dedicated to high-precision and high-strength industrial scenarios, and its production process and performance indicators are higher than C75/CK75. It is the authoritative standard material for European high-end precision instruments, new energy vehicles, and high-grade tool manufacturing.

All our precision steel strips fully comply with corresponding regional standards, support third-party testing (SGS, CE, ISO), and can provide standard certification reports for Europe, America, and China to meet global customer procurement and production qualification requirements.