QML40CR-C

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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.

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QML40Cr-C · Q/XG 243-2019

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

Material category: Alloy steel
Material form: Wire rod
Original record status: Original standard verified
Standard edition: Q/XG 243-2019
Table / clause: Table 3, row 6
PDF page references: 3
Unit: Mass fraction (wt%)

Carbon-equivalent reference

IIW / CEV：0.6600–0.8667Known-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）：0.4600–0.5800Known-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：0.4850–0.6150Known-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	0.38 ～ 0.45
Si	0.15 ～ 0.35
Mn	0.6 ～ 0.9
P	≤ 0.025 (lower limit not stated)
S	≤ 0.02 (lower limit not stated)
Cr	0.9 ～ 1.2
Ni	≤ 0.2 (lower limit not stated)
Cu	≤ 0.2 (lower limit not stated)

Applicability and limitations

Mass fraction wt%; Q/XG 243-2019 heat analysis; Local PDF, page 3. Check product-analysis tolerances under GB/T 222; Heat-analysis ranges are not directly treated as guaranteed product-analysis ranges. The enterprise standard covers passenger-vehicle cold-heading steel wire rod requiring vehicle-manufacturer approval; it does not establish Creation Group stock availability, customer approval or substitution approval. Clause 5.4: where a higher or enhanced cold-upsetting level is required, C≥0.30% specimens must first be spheroidize-annealed.

Combined limits

Combined-element limits

Elements requiring measured values from the same heat

Verification notes

Original Q/XG 243-2019, Table 3 PDF, page 3: rows and merged cells were visually checked