GB · China · 5 designations

T9

T9 is a designation in GB for the grade also listed as BW1A. We list 5 designations recorded for this grade, in the standards BS, ISO, JIS, GB and GOST.

Designations 5

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Also known as

5 designations · 5 standards · nothing hidden

This grade’s own namerecorded in our sources as this grade’s own designation under that standard.

Indicativetaken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.

Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

BSUnited Kingdom · 1

BW1AIndicative

ISOInternational · 1

TC90Indicative

JISJapan · 1

SK5Indicative

GBChina · 1

T9This grade’s own name

GOSTRussia / CIS · 1

У9Indicative

Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.

Chemical composition

7 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 98 %C — 0.9 %Cr — 0.3 %Si — 0.3 %Traces & impurities · 0.6 %

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

Element	% by weight
	0.85–0.94
	0.17–0.37
	0.1–0.4
	≤ 0.03
	≤ 0.025
	≤ 0.3
	≤ 0.25

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	0.85-0.94	0.850	0.940	Range
Si	0.17-0.37	0.170	0.370	Range
P	≤0.03	—	0.030	Max
S	≤0.025	—	0.025	Max
Cr	≤0.3	—	0.300	Max
Mn	0.1-0.4	0.100	0.400	Range
Cu	≤0.25	—	0.250	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: Ni, 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

1 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 1299-2025

Single operationTest specimen

Quenching760–780 °C
Cooling Water

Supply condition

AnnealingSupply condition

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

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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