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GB/T 699 25Mn vs GB/T 699 30

Close Alternative — 75.5% match based on chemical composition and mechanical property overlap.

GB/T 699 25Mn (GB/T 699:2015) and GB/T 699 30 (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 25Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 30 is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 25Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 30 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 25Mn vs GB/T 699 30 is a 88.3% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 75.5%.

Frequently Compared With GB/T 699 25Mn:
BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
88.3%
MECHANICAL MATCH
50%
OVERALL
75.5%
Specifications
Property GB/T 699 25Mn GB/T 699 30
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.22-0.29 0.27-0.34
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.70-1.00 0.50-0.80
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 25Mn GB/T 699 30
Tensile Strength >=490 MPa >=490 MPa
Yield Strength >=295 MPa >=295 MPa
Elongation >=22% >=21%
Hardness <=207 HB (as delivered, not heat treated) <=179 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 25Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 30
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 25Mn Be Substituted With GB/T 699 30?
GB/T 699 25Mn and GB/T 699 30 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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GB/T 699 25Mn
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GB/T 699 30
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Frequently Asked Questions
What is the difference between GB/T 699 25Mn and GB/T 699 30?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 25Mn be substituted with GB/T 699 30?
GB/T 699 25Mn and GB/T 699 30 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.