GB · China · 1 designation

HP235

HP235 is a grade designated under GB. Its recorded composition includes C ≤ 0.16%, Cr ≤ 0.3%, Mn ≤ 0.8%, Ni ≤ 0.3% and Mo ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 380–500 N/mm² and A ≥ 23%.

Designations 1

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Chemical composition

13 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 97.6 %Mn — 0.8 %Cr — 0.3 %Mo — 0.3 %Traces & impurities · 1 %

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

Element	% by weight
	≤ 0.16
	≤ 0.1
	≤ 0.8
	≤ 0.025
	≤ 0.012
	≤ 0.3
	≤ 0.3
	≤ 0.3
	≤ 0.1
	≤ 0.2
	≥ 0.015
	≤ 0.06
	≤ 0.05

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	≤0.16	—	0.160	Max
Al	≥0.015	0.015	—	Min
Si	≤0.1	—	0.100	Max
P	≤0.025	—	0.025	Max
S	≤0.012	—	0.012	Max
Ti	≤0.06	—	0.060	Max
V	≤0.1	—	0.100	Max
Cr	≤0.3	—	0.300	Max
Mn	≤0.8	—	0.800	Max
Ni	≤0.3	—	0.300	Max
Cu	≤0.2	—	0.200	Max
Nb	≤0.05	—	0.050	Max
Mo	≤0.3	—	0.300	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

computed from composition · °C

Predicted Ae3813°C

Predicted Ae1717°C

Predicted Acm394°C

Predicted Bs573°C

These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.

Physical & mechanical properties

Rm380~500N/mm²Range

A≥23(t＜3)；≥29(t≥3)%Min

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.

Looking for this grade under another name?

Search the catalogue by designation, material number or composition — every name on this page is itself a way in.

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