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GB/T 699 80 vs GB/T 699 70Mn

Related Material — 65.5% match based on chemical composition and mechanical property overlap.

GB/T 699 80 (GB/T 699:2015) and GB/T 699 70Mn (GB/T 699:2015) 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 GB/T 699 70Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 80 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 70Mn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 80 vs GB/T 699 70Mn is a 85.7% match. As per mechanical properties, the match is 25%. Combined, this makes them a related material overall at 65.5%.

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 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 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
25%
OVERALL
65.5%
Specifications
Property GB/T 699 80 GB/T 699 70Mn
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.77-0.85 0.67-0.75
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.50-0.80 0.90-1.20
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 80 GB/T 699 70Mn
Tensile Strength >=1080 MPa >=785 MPa
Yield Strength >=930 MPa >=450 MPa
Elongation >=6% >=8%
Hardness <=285 HB (as delivered, not heat treated) <=285 HB (as delivered, not heat treated)
Condition Quenched and tempered sample (with working allowance), 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 80
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 70Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 80 Be Substituted With GB/T 699 70Mn?
GB/T 699 80 and GB/T 699 70Mn 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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GB/T 699 70Mn
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Frequently Asked Questions
What is the difference between GB/T 699 80 and GB/T 699 70Mn?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 80 be substituted with GB/T 699 70Mn?
GB/T 699 80 and GB/T 699 70Mn 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.