KCH21KT

1 source records. Standards, editions and conditions are presented separately; matching grade names do not establish interchangeability.

Refer to each source for mass fractions and analysis type. Missing values are not treated as 0. Manufacturer typical values, standard guarantees and measured heat results must remain separate. Use the material selector for calculations and condition selection.

Open condition selection, comparison and carbon-equivalent tools for KCH21KT →

KCH21KT · Kobe Steel manufacturer specifications (KCH series)

Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results

Material category: Carbon steel
Subcategory: Carbon steel
Material form: Wire rod
Composition basis: Manufacturer-published composition range
Original record status: Manufacturer source verified
Document edition: Publication edition not stated in the document
Document title: Wire rod and bar specification tables
Table / clause: 6-8 · KCH xx K · series
PDF page references: 28
Manufacturer: Kobe Steel

Carbon-equivalent reference

Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.

IIW / CEV：0.2800–0.4533Known-element contribution; incomplete value; missing Mo, V CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.

Pcm（Ito–Bessyo）：0.2150–0.3133Known-element contribution; incomplete value; missing Mo, V, B Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.

CET：0.2400–0.3500Known-element contribution; incomplete value; missing Mo CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.

Composition

Element	Composition requirement
C	0.18 ～ 0.23
Si	0.15 ～ 0.3
Mn	0.6 ～ 0.9
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)
Ni	≤ 0.2 (lower limit not stated)
Cr	≤ 0.2 (lower limit not stated)

Applicability and limitations

Kobe Steel manufacturer specifications for carbon-steel wire rod for cold heading, not the original JIS or AISI standards. Similar standard grades in the catalogue do not establish direct substitutability or supply by our company. Publication edition not stated.

Composition conditions

Table note: Cu≤0.30%, Ni≤0.20%, Cr≤0.20%; chemistry is in mass percent.
The catalogue gives no publication edition; file creation time is not treated as the technical specification's effective year.

Verification notes

Manufacturer original table and notes checked; publication edition not stated.