Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
GB/T 699 55 (GB/T 699:2015) and BS 970 (Part 3) 045A10 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 55 is typically used for used for springs, wear plates, shafts, rollers, high-strength pins, and machine tools., while BS 970 (Part 3) 045A10 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (table 14).
GB/T 699 55 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 045A10 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, GB/T 699 55 vs BS 970 (Part 3) 045A10 is a 67% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
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 55
BS 970 (Part 3) 045A10
Tensile Strength
>=645 MPa
Not specified
Yield Strength
>=380 MPa
Not specified
Elongation
>=13%
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 55
Used for springs, wear plates, shafts, rollers, high-strength pins, and machine tools.
BS 970 (Part 3) 045A10
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (Table 14)
Key Differences
GB/T 699 55 specifies Cr, Ni, Cu which are not specified for BS 970 (Part 3) 045A10.
Can GB/T 699 55 Be Substituted With BS 970 (Part 3) 045A10?
GB/T 699 55 and BS 970 (Part 3) 045A10 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 55 and BS 970 (Part 3) 045A10?
GB/T 699 55 specifies Cr, Ni, Cu which are not specified for BS 970 (Part 3) 045A10.
Can GB/T 699 55 be substituted with BS 970 (Part 3) 045A10?
GB/T 699 55 and BS 970 (Part 3) 045A10 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.