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GB/T 8731 Y35 vs BS 970 (Part 1) 225M36

Close Alternative — 84.9% match based on chemical composition and mechanical property overlap.

GB/T 8731 Y35 (GB/T 8731-2025) and BS 970 (Part 1) 225M36 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Free Machining Steel category. GB/T 8731 Y35 is typically used for used for screws, nuts, fittings, precision turned parts, bushings, and automatic lathe components., while BS 970 (Part 1) 225M36 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. GB/T 8731 Y35 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 225M36 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 8731 Y35 vs BS 970 (Part 1) 225M36 is a 84.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 84.9%.

Frequently Compared With GB/T 8731 Y35:
SAE J403 1138 SAE J403 1117 SAE J403 1138 SAE J403 1118 SAE J403 1137 SAE J403 1138 SAE J403 1117 SAE J403 1117 SAE J403 1118 SAE J403 1118 SAE J403 1126 IS 1570 (Part 3) 10C8S10
Match Breakdown
CHEMISTRY MATCH
84.9%
MECHANICAL MATCH
No shared data
OVERALL
84.9%
Specifications
Property GB/T 8731 Y35 BS 970 (Part 1) 225M36
Standard GB/T 8731-2025 BS 970 (Part 1):1983
Category Free Machining Steel Free Machining Steel
C (%) 0.32-0.39 0.32-0.40
Si (%) 0.15 max <=0.25
Mn (%) 0.70-1.00 1.00-1.40
S (%) 0.20-0.35 0.20-0.30
P (%) 0.07-0.12 <=0.060
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 8731 Y35 BS 970 (Part 1) 225M36
Tensile Strength 520-680 MPa Not specified
Yield Strength 315-420 MPa Not specified
Elongation 10-16% Not specified
Hardness 140-190 HB Not specified
Typical Applications
GB/T 8731 Y35
Used for screws, nuts, fittings, precision turned parts, bushings, and automatic lathe components.
BS 970 (Part 1) 225M36
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Can GB/T 8731 Y35 Be Substituted With BS 970 (Part 1) 225M36?
GB/T 8731 Y35 and BS 970 (Part 1) 225M36 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GB/T 8731 Y35
Hex Bar → (2 listings)
Across Flats: 25–25 mm (0.98–0.98 in)
Length: 2900–3700 mm (114.17–145.67 in)
BS 970 (Part 1) 225M36
No active listings currently.
On M-EX Right Now
GB/T 8731 Y35
2 active listings and RFQs →
BS 970 (Part 1) 225M36
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 8731 Y35 and BS 970 (Part 1) 225M36?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 8731 Y35 be substituted with BS 970 (Part 1) 225M36?
GB/T 8731 Y35 and BS 970 (Part 1) 225M36 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.