MNB120H

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 MNB120H →

MnB120H · Q/320582 SGY503-2024 (1st edition)

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: Edition 1 (2024); issued 2024-04-26; effective 2024-05-01
Document title: Hot-rolled cold-heading steel wire rod for automotive fasteners
Table / clause: Table 1
PDF page references: 5
Unit: Mass fraction (wt%)
Manufacturer: Jiangsu Shagang 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：0.2800–0.4767Known-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）：≥ 0.2140Known-element contribution; incomplete value; missing V; B has no specified upper limit; the carbon-equivalent upper bound cannot be determined 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：0.2400–0.3550 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	0.18 ～ 0.23
Si	≤ 0.1 (lower limit not stated)
Mn	0.6 ～ 0.9
P	≤ 0.02 (lower limit not stated)
S	≤ 0.015 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
Mo	≤ 0.05 (lower limit not stated)
B	≥ 0.0008 (upper limit not stated)
Ni	≤ 0.2 (lower limit not stated)
Cu	≤ 0.2 (lower limit not stated)

Applicability and limitations

Shagang Q/320582 SGY503-2024 (edition 1), Table 1, row 27 (PDF page 5), cast analysis wt%; original grades and values of this edition are shown independently. Orders and actual supply require separate confirmation; this is not a supply commitment by Creation Group.

Composition conditions

2024, 1st edition, Table 1: heat analysis, mass fraction wt%; a dash is not zero.
Clause 6.1.3 residual limits: Cr≤0.20%, Ni≤0.20%, Cu≤0.20%, Mo≤0.05%; where Table 1 specifies otherwise, follow the grade entry.
AlT is the lower limit for total aluminium; B has a separate column, and Ti, V, etc. are in notes; preserve grade suffixes exactly as printed in this edition.
Table 2: oxygen≤30×10⁻⁶ and nitrogen≤70×10⁻⁶; these are not alloy-element fields in mass fraction wt%.
Measured hardness and mechanical data in Clauses 6.10/6.11 are not delivery requirements; no generic properties are entered.

Verification notes

Manufacturer catalogue, 2024 edition 1: text extracted directly from the black original table and checked row by row; the blue public watermark was excluded from the extraction layer.

MnB120H · Q/XG 243-2019

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

Material category: Boron steels
Material form: Wire rod
Original record status: Original standard verified
Standard edition: Q/XG 243-2019
Table / clause: Table 2, row 2
PDF page references: 2
Unit: Mass fraction (wt%)

Carbon-equivalent reference

IIW / CEV：0.2967–0.4833Known-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）：0.2190–0.3267Known-element contribution; incomplete value; missing Mo, V 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：0.2500–0.3600Known-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	≤ 0.1 (lower limit not stated)
Mn	0.7 ～ 1.0
P	≤ 0.025 (lower limit not stated)
S	≤ 0.02 (lower limit not stated)
B	0.0008 ～ 0.003
Al	≥ 0.02 (upper limit not stated)
Cr	≤ 0.3 (lower limit not stated)
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 2. 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.

Combined limits

Combined-element limits

Elements requiring measured values from the same heat

Verification notes

Original Q/XG 243-2019, Table 2 PDF, page 2: rows and merged cells were visually checked