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GB/T 699 20Mn vs IS 1570 (Part 7) 12C7H

Related Material — 66.9% match based on chemical composition and mechanical property overlap.

GB/T 699 20Mn (GB/T 699:2015) and IS 1570 (Part 7) 12C7H (IS 1570 (Part 7):1992) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 20Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while IS 1570 (Part 7) 12C7H is commonly used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature. GB/T 699 20Mn is defined under Guobiao Standards (GB/T), originating from China, while IS 1570 (Part 7) 12C7H is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, GB/T 699 20Mn vs IS 1570 (Part 7) 12C7H is a 83.7% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a related material overall at 66.9%.

Frequently Compared With GB/T 699 20Mn:
BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 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
Match Breakdown
CHEMISTRY MATCH
83.7%
MECHANICAL MATCH
33.3%
OVERALL
66.9%
Specifications
Property GB/T 699 20Mn IS 1570 (Part 7) 12C7H
Standard GB/T 699:2015 IS 1570 (Part 7):1992
Category Carbon Steel Carbon Steel
C (%) 0.17-0.23 <=0.17
Si (%) 0.17-0.37 0.10-0.35
Mn (%) 0.70-1.00 0.40-1.00
P (%) <=0.035 <=0.045
S (%) <=0.035 <=0.045
Cr (%) <=0.25 <=0.25
Ni (%) <=0.30 <=0.35
Cu (%) <=0.25 <=0.30
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 20Mn IS 1570 (Part 7) 12C7H
Tensile Strength >=450 MPa 360-480 MPa
Yield Strength >=275 MPa >=215 MPa (0.2 % proof stress)
Elongation >=24% >=24%
Hardness <=197 HB (as delivered, not heat treated) Not specified
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Seamless pipe and pipe with seam, N, thickness - (first row of Table 3)
Typical Applications
GB/T 699 20Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
IS 1570 (Part 7) 12C7H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
Can GB/T 699 20Mn Be Substituted With IS 1570 (Part 7) 12C7H?
GB/T 699 20Mn and IS 1570 (Part 7) 12C7H 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 20Mn
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IS 1570 (Part 7) 12C7H
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Frequently Asked Questions
What is the difference between GB/T 699 20Mn and IS 1570 (Part 7) 12C7H?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 20Mn be substituted with IS 1570 (Part 7) 12C7H?
GB/T 699 20Mn and IS 1570 (Part 7) 12C7H 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.