Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
GB/T 699 80 (GB/T 699:2015) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
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 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
GB/T 699 80 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, GB/T 699 80 vs BS 970 (Part 1) 055M15 is a 64.1% match.
As per mechanical properties, the match is 0%.
Combined, this makes them a minimal match overall at 35%.
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 1) 055M15
Tensile Strength
>=1080 MPa
310 MPa min
Yield Strength
>=930 MPa
Not specified
Elongation
>=6%
25 % min
Hardness
<=285 HB (as delivered, not heat treated)
121 HB min
Condition
Quenched and tempered sample (with working allowance), bars up to 80 mm; hardness for delivery state
As-rolled
Typical Applications
GB/T 699 80
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
GB/T 699 80 specifies Si, P, S, Cr which are not specified for BS 970 (Part 1) 055M15.
Can GB/T 699 80 Be Substituted With BS 970 (Part 1) 055M15?
GB/T 699 80 and BS 970 (Part 1) 055M15 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.
What is the difference between GB/T 699 80 and BS 970 (Part 1) 055M15?
GB/T 699 80 specifies Si, P, S, Cr which are not specified for BS 970 (Part 1) 055M15.
Can GB/T 699 80 be substituted with BS 970 (Part 1) 055M15?
GB/T 699 80 and BS 970 (Part 1) 055M15 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.