GB · China · 1 designation

21Cr12MoV

21Cr12MoV is a grade designated under GB. Its recorded composition includes C 0.18–0.24%, Cr 11–12.5%, Mn 0.3–0.8%, Ni 0.3–0.6% and Mo 0.8–1.2%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 255.

Designations 1

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Chemical composition

10 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 85.1 %Cr — 11.8 %Mo — 1 %Mn — 0.6 %Traces & impurities · 1.6 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

Element	% by weight
	0.18–0.24
	0.1–0.5
	0.3–0.8
	≤ 0.03
	≤ 0.025
	11–12.5
	0.8–1.2
	0.3–0.6
	0.25–0.35
	≤ 0.3

0.01 %0.1 %1 %10 %100 %

The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other.

Element	As publishedsource text, verbatim	Min% by weight	Max% by weight	Bound
C	0.18-0.24	0.180	0.240	Range
Si	0.1-0.5	0.100	0.500	Range
P	≤0.03	—	0.030	Max
S	≤0.025	—	0.025	Max
V	0.25-0.35	0.250	0.350	Range
Cr	11-12.5	11.000	12.500	Range
Mn	0.3-0.8	0.300	0.800	Range
Ni	0.3-0.6	0.300	0.600	Range
Cu	≤0.3	—	0.300	Max
Mo	0.8-1.2	0.800	1.200	Range

The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred.

Predicted transformation temperatures

This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here.

Physical & mechanical properties

An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material.

Properties by condition

0 conditions · 0 values

2 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition.

Heat treatment

GB /T 8732-2014

Order not stated by the sourceSteel product

Annealing880–930 °C
Cooling Slow cooling
Tempering750–770 °C
Cooling Fast cooling

The source lists these operations without stating an order or an alternation. They are shown unordered on purpose.

In this orderd=25

Quenching
1020–1050 °C1020–1070 °C
Cooling Oil
Tempering
700–750 °C650 °C
Cooling Air

Source: www.caishuku.com

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