QML42CRMO

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.

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QML42CrMo · Q/320412 ZTG 223—2021

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

Material category: Cold-heading steel
Subcategory: Cold-heading steel
Material form: Wire rod
Original record status: Manufacturer source verified
Document edition: 2021 edition; Published and implemented 2021-05-18; Supersedes 2020 edition
Document title: Hot-rolled cold-heading steel wire rod for automotive fasteners
Table / clause: Table 2
PDF page references: 5
Unit: Mass fraction (wt%)
Manufacturer: Zenith Steel Group Co., Ltd.

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：0.7100–0.9033Known-element contribution; incomplete value; missing 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）：0.4900–0.5817Known-element contribution; incomplete value; missing 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：0.5200–0.6275 Envelope of independent element limits from manufacturer data; neither standard guarantee values nor measured heat results 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	0.4 ～ 0.44
Si	0.15 ～ 0.3
Mn	0.6 ～ 0.9
P	≤ 0.02 (lower limit not stated)
S	≤ 0.02 (lower limit not stated)
Cr	0.9 ～ 1.2
Mo	0.15 ～ 0.3
Al	≥ 0.02 (upper limit not stated)
Ni	≤ 0.1 (lower limit not stated)
Cu	≤ 0.1 (lower limit not stated)

Applicability and limitations

Zhongtian Steel Q/320412 ZTG 223—2021, Table 2, row 11, PDF page 5, cast analysis wt%. Applies to hot-rolled wire rod; specific orders, delivery and supply by Creation Group require separate confirmation.

Composition conditions

Table 2 heat analysis, mass fractions wt%; Upper limits for residual Cr, Ni, Cu, and Mo for Group II shall be supplemented according to Table 3, with priority given to specific provisions within the table.
Applicable to hot-rolled round wire rod of Φ5.5–25.0mm for automotive fasteners; Wire rod is delivered in the hot-rolled condition.
A horizontal line indicates that the limit is not listed in the table, which does not equal zero; Measured mechanical-property data in the hot-rolled condition are to be reported for information only; they are not general guaranteed values.

Verification notes

Both grade tables and residual-element groups in the publicly available 2021 edition were checked row by row; Verification excludes the watermark color layer in the PDF source document.