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GB/T 699 65 vs GB/T 699 50Mn

Related Material — 66.2% match based on chemical composition and mechanical property overlap.

GB/T 699 65 (GB/T 699:2015) and GB/T 699 50Mn (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 65 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 50Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 65 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 50Mn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 65 vs GB/T 699 50Mn is a 86.9% match. As per mechanical properties, the match is 25%. Combined, this makes them a related material overall at 66.2%.

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
86.9%
MECHANICAL MATCH
25%
OVERALL
66.2%
Specifications
Property GB/T 699 65 GB/T 699 50Mn
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.62-0.70 0.48-0.56
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.50-0.80 0.70-1.00
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.035
Cr (%) <=0.25 <=0.25
Ni (%) <=0.30 <=0.30
Cu (%) <=0.25 <=0.25
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 GB/T 699 50Mn
Tensile Strength >=695 MPa >=645 MPa
Yield Strength >=410 MPa >=390 MPa
Elongation >=10% >=13%
Hardness <=255 HB (as delivered, not heat treated) <=255 HB (as delivered, not heat treated)
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Typical Applications
GB/T 699 65
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 50Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 65 Be Substituted With GB/T 699 50Mn?
GB/T 699 65 and GB/T 699 50Mn 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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GB/T 699 50Mn
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Frequently Asked Questions
What is the difference between GB/T 699 65 and GB/T 699 50Mn?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 65 be substituted with GB/T 699 50Mn?
GB/T 699 65 and GB/T 699 50Mn 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.