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GB/T 699 80 vs BS 970 (Part 3) 635M15

Related Material — 65% match based on chemical composition and mechanical property overlap.

GB/T 699 80 (GB/T 699:2015) and BS 970 (Part 3) 635M15 (BS 970 (Part 3):1991) are both steel grades. GB/T 699 80 is classified under Carbon Steel, while BS 970 (Part 3) 635M15 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 699 80 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while BS 970 (Part 3) 635M15 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15). GB/T 699 80 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 635M15 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 699 80 vs BS 970 (Part 3) 635M15 is a 66% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With GB/T 699 80:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
66%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 699 80 BS 970 (Part 3) 635M15
Standard GB/T 699:2015 BS 970 (Part 3):1991
Category Carbon Steel Alloy Steel
C (%) 0.77-0.85 0.12-0.18
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.50-0.80 0.60-0.90
P (%) <=0.035 <=0.04
S (%) <=0.035 <=0.05
Cr (%) <=0.25 0.4-0.80
Ni (%) <=0.30 0.70-1.10
Cu (%) <=0.25 Not specified
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 699 80 BS 970 (Part 3) 635M15
Tensile Strength >=1080 MPa Not specified
Yield Strength >=930 MPa Not specified
Elongation >=6% Not specified
Hardness <=285 HB (as delivered, not heat treated) Not specified
Condition Quenched and tempered sample (with working allowance), bars up to 80 mm; hardness for delivery state Not specified
Typical Applications
GB/T 699 80
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
BS 970 (Part 3) 635M15
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Key Differences
Can GB/T 699 80 Be Substituted With BS 970 (Part 3) 635M15?
GB/T 699 80 and BS 970 (Part 3) 635M15 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.
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GB/T 699 80
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BS 970 (Part 3) 635M15
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Frequently Asked Questions
What is the difference between GB/T 699 80 and BS 970 (Part 3) 635M15?
Different category: GB/T 699 80 is Carbon Steel, BS 970 (Part 3) 635M15 is Alloy Steel. GB/T 699 80 specifies Cu which is not specified for BS 970 (Part 3) 635M15.
Can GB/T 699 80 be substituted with BS 970 (Part 3) 635M15?
GB/T 699 80 and BS 970 (Part 3) 635M15 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.