C30EC

2 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 C30EC →

C30EC · ISO 4954

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

Material form: Cold-heading wire
Original record status: Reference transcription of standard
Standard edition: ISO 4954:2018
Table / clause: Table C.2

Carbon-equivalent reference

IIW / CEV：0.3533–0.4800Known-element contribution; incomplete value; missing Cr, Mo, V, Ni 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）：0.2950–0.3925Known-element contribution; incomplete value; missing Cr, Ni, 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：0.3200–0.4225Known-element contribution; incomplete value; missing Mo, Cr, Ni 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	0.27 ～ 0.33
Si	≤ 0.3 (lower limit not stated)
Mn	0.5 ～ 0.8
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cu	≤ 0.25 (lower limit not stated)

Applicability and limitations

ISO 4954:2018; heat analysis, mass fraction %; values without a stated range are upper limits; see the source page for complete table footnotes. The website does not specify the edition; the source edition is shown here and does not establish contractual applicability.

Verification notes

Standard source: ISO 4954:2018 · Table C.2View associated products →

C30EC · ISO 4954-2018

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

Material category: Carbon steel
Subcategory: Steel for quenching and tempering
Material form: Reference record
Original record status: Original standard verified
Standard edition: ISO 4954:2018
Table / clause: Table C.2

Carbon-equivalent reference

Composition

Element	Composition requirement
C	0.27 ～ 0.33
Si	≤ 0.3 (lower limit not stated)
Mn	0.5 ～ 0.8
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cu	≤ 0.25 (lower limit not stated)

Applicability and limitations

ISO 4954:2018, Table C.2 gives heat analysis; A single value is a maximum; a dash is not zero. ; Product-analysis tolerances are listed separately under Table 2/3 of the standard and do not directly widen the heat-analysis composition ranges. ; Optional Al0.020–0.050% to improve cold-heading performance; this is not a universal mandatory minimum. ; Low Si may be agreed in the order, taking hardenability into account; Where hardenability is required, the standard permits limited deviations, except for P/S; C must not exceed 0.01%; see Table 2 for the other requirements. ; For C, a range of width 0.04% may be agreed; it does not replace the tabulated range by default.

Verification notes

Table C.2 and its footnotes in the standard text were checked.