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GB/T 8731 Y35 vs IS 1570 (Part 3) 10C8S10

Minimal Match — 49.9% match based on chemical composition and mechanical property overlap.

GB/T 8731 Y35 (GB/T 8731-2025) and IS 1570 (Part 3) 10C8S10 (IS 1570 (Part 3):1979) are both steel grades. Both fall under the Free Machining Steel category. GB/T 8731 Y35 is defined under Guobiao Standards (GB/T), originating from China, while IS 1570 (Part 3) 10C8S10 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, GB/T 8731 Y35 vs IS 1570 (Part 3) 10C8S10 is a 74.8% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 49.9%.

Frequently Compared With GB/T 8731 Y35:
SAE J403 1138 SAE J403 1138 SAE J403 1117 SAE J403 1118 SAE J403 1137 SAE J403 1138 SAE J403 1117 SAE J403 1118 SAE J403 1126 SAE J403 1117 SAE J403 1118 IS 4432 10C8S10
Match Breakdown
CHEMISTRY MATCH
74.8%
MECHANICAL MATCH
0%
OVERALL
49.9%
Specifications
Property GB/T 8731 Y35 IS 1570 (Part 3) 10C8S10
Standard GB/T 8731-2025 IS 1570 (Part 3):1979
Category Free Machining Steel Free Machining Steel
C (%) 0.32-0.39 <=0.15
Si (%) 0.15 max 0.05-0.30
Mn (%) 0.70-1.00 0.60-0.90
S (%) 0.20-0.35 0.08-0.13
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 IS 1570 (Part 3) 10C8S10
Tensile Strength 520-680 MPa 370-490 MPa
Yield Strength 315-420 MPa Not specified
Elongation 10-16% >=24%
Hardness 140-190 HB Not specified
Condition Not specified Hot rolled or normalized bars, billets and forgings (Table 2), ruling sections up to 150 mm
Typical Applications
GB/T 8731 Y35
Used for screws, nuts, fittings, precision turned parts, bushings, and automatic lathe components.
IS 1570 (Part 3) 10C8S10
Not documented
Can GB/T 8731 Y35 Be Substituted With IS 1570 (Part 3) 10C8S10?
GB/T 8731 Y35 and IS 1570 (Part 3) 10C8S10 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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)
IS 1570 (Part 3) 10C8S10
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On M-EX Right Now
GB/T 8731 Y35
2 active listings and RFQs →
IS 1570 (Part 3) 10C8S10
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Frequently Asked Questions
What is the difference between GB/T 8731 Y35 and IS 1570 (Part 3) 10C8S10?
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 IS 1570 (Part 3) 10C8S10?
GB/T 8731 Y35 and IS 1570 (Part 3) 10C8S10 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.