NHB30

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 NHB30 →

NHB30 · Nippon Steel Wire Rods EXE203 2008.3 / Nippon Steel standards (as listed in this catalogue)

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
Original record status: Manufacturer source verified
Document edition: Cat. No. EXE203 2008.3 PDF; cover copyright 2008
Document title: Nippon Steel Wire Rods
Table / clause: Printed page 23, table index 2
PDF page references: 13
Unit: Mass fraction (%)
Analysis type: The original catalogue does not explicitly identify the analysis type for this table
Manufacturer: NIPPON STEEL CORPORATION

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：0.3700–0.5000Known-element contribution; incomplete value; missing Cr, Mo, V, Ni; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable 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）：≥ 0.3075Known-element contribution; incomplete value; missing Cr, Ni, Mo, V; B has no specified upper limit; the carbon-equivalent upper bound cannot be determined; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable 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：0.3300–0.4350Known-element contribution; incomplete value; missing Mo, Cr, Ni; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable 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	0.15 ～ 0.35
Mn	0.6 ～ 0.9
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
B	≥ 0.0005 (upper limit not stated)
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

Historical Nippon Steel wire-rod catalogue EXE203 2008.3, PDF page 13

printed page 23, Nippon Steel Standards (as stated in this catalogue). The original catalogue does not explicitly identify the analysis type for this table. Manufacturer range data, not guaranteed standard limits or heat-specific measurements; this does not establish supply by Creation Group. Condition: Ni+Cr≤0.15 is only a total-content constraint; individual lower or upper limits are not invented; Only a minimum is given for B. Mechanical properties and other tests are by agreement.

Composition conditions

Original catalogue mass percentages, historical manufacturer data from 2008.3; Referenced standard names and editions follow the original document; this does not establish that the official texts of those standards have been obtained and verified.
A dash or blank must not be treated as 0; only chemical composition has been checked in this batch. Mechanical properties and actual supply require separate verification under the applicable conditions.
Ni+Cr≤0.15 is only a total-content constraint; individual lower or upper limits are not invented; Only a minimum is given for B. Mechanical properties and other tests are by agreement.

Combined limits

Element-sum limits

Elements concerned
- Ni
- Cr
Upper limit
0.15

Elements requiring measured values from the same heat

Verification notes

Grouped tables were expanded in full and checked against original images and notes. Ordinary, residual and conditional elements are kept separate; suffix tables lacking complete base-steel composition are excluded.