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GB/T 699 65 vs BS 970 (Part 3) 637M17

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

GB/T 699 65 (GB/T 699:2015) and BS 970 (Part 3) 637M17 (BS 970 (Part 3):1991) are both steel grades. GB/T 699 65 is classified under Carbon Steel, while BS 970 (Part 3) 637M17 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 699 65 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while BS 970 (Part 3) 637M17 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 65 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 637M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 699 65 vs BS 970 (Part 3) 637M17 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 65:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
66%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 699 65 BS 970 (Part 3) 637M17
Standard GB/T 699:2015 BS 970 (Part 3):1991
Category Carbon Steel Alloy Steel
C (%) 0.62-0.70 0.14-0.20
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 0.60-1.00
Ni (%) <=0.30 0.85-1.25
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 65 BS 970 (Part 3) 637M17
Tensile Strength >=695 MPa Not specified
Yield Strength >=410 MPa Not specified
Elongation >=10% Not specified
Hardness <=255 HB (as delivered, not heat treated) Not specified
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Not specified
Typical Applications
GB/T 699 65
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
BS 970 (Part 3) 637M17
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 65 Be Substituted With BS 970 (Part 3) 637M17?
GB/T 699 65 and BS 970 (Part 3) 637M17 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 65
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BS 970 (Part 3) 637M17
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Frequently Asked Questions
What is the difference between GB/T 699 65 and BS 970 (Part 3) 637M17?
Different category: GB/T 699 65 is Carbon Steel, BS 970 (Part 3) 637M17 is Alloy Steel. GB/T 699 65 specifies Cu which is not specified for BS 970 (Part 3) 637M17.
Can GB/T 699 65 be substituted with BS 970 (Part 3) 637M17?
GB/T 699 65 and BS 970 (Part 3) 637M17 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.