GB · China · 1 designation

ML28B

ML28B is a grade designated under GB. Its recorded composition includes C 0.25–0.32%, Si ≤ 0.4%, Cr ≤ 0.2%, Mn 0.6–0.9% and Ni ≤ 0.2%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 530–630 N/mm², Re ≥ 480 N/mm² and A 14–62%; these figures vary with the delivery condition and dimension.

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 — 97.9 %Mn — 0.8 %Si — 0.4 %C — 0.3 %Traces & impurities · 0.7 %

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

Element	% by weight
	0.25–0.32
	≤ 0.4
	0.6–0.9
	≤ 0.035
	≤ 0.035
	≤ 0.2
	≤ 0.2
	≤ 0.2
	≥ 0.02
	0.0005–0.0035

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
B	0.0005-0.0035	0.001	0.004	Range
C	0.25-0.32	0.250	0.320	Range
Al	≥0.02	0.020	—	Min
Si	≤0.4	—	0.400	Max
P	≤0.035	—	0.035	Max
S	≤0.035	—	0.035	Max
Cr	≤0.2	—	0.200	Max
Mn	0.6-0.9	0.600	0.900	Range
Ni	≤0.2	—	0.200	Max
Cu	≤0.2	—	0.200	Max

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

Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo.

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

5 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 6478-2015

In this orderTest specimen diameterd=25

Normalizing870–900 °C
Quenching850–890 °C
Quenchant Water or Oil
Tempering550–660 °C

GB T 6478-2001

In this order

Normalizing870–900 °C
Quenching850–890 °C
Quenchant Water or Oil
Tempering550–660 °C

Supply condition

Annealing

Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.

Source: www.caishuku.com

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