ISO · International · 11 designations

TC120

TC120 is a designation in ISO for the grade also listed as C120U. We list 11 designations recorded for this grade, in the standards DIN / EN, BS, AFNOR, ISO, JIS, GB, GOST and KS.

Designations 11

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If you came for one of these

The most-used names for this grade.

GBT12This grade’s own name

Also known as

11 designations · 8 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 2

BSUnited Kingdom · 2

AFNORFrance · 1

C120UIndicative

ISOInternational · 2

C120UIndicative
TC120Indicative

JISJapan · 1

SK120Indicative

GBChina · 1

T12This grade’s own name

GOSTRussia / CIS · 1

У12-1Indicative

KSSouth Korea · 1

STC2Indicative

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 — 97.7 %C — 1.2 %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
	1.15–1.24 —
	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	1.15-1.24	1.150	1.240	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

QuenchingTest specimen
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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