KNDS2

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 KNDS2 →

KNDS2 · Kobe Steel manufacturer specification (section 6-11)

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

Material category: Alloy steel
Subcategory: High-strength bolt steel
Material form: Wire rod
Original record status: Manufacturer source verified
Document edition: Publication edition not stated in the document
Document title: Wire rod and bar specification tables
Table / clause: 6-11
PDF page references: 31
Unit: Mass fraction (wt%)
Manufacturer: Kobe Steel

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：0.6117–0.8583Known-element contribution; incomplete value; missing V, Ni, Cu 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）：0.4050–0.5317Known-element contribution; incomplete value; missing Cu, Ni, 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：0.4325–0.5775Known-element contribution; incomplete value; missing Cu, 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	0.32 ～ 0.39
Si	0.15 ～ 0.35
Mn	0.55 ～ 0.95
P	≤ 0.01 (lower limit not stated)
S	≤ 0.01 (lower limit not stated)
Cr	0.85 ～ 1.25
Mo	0.15 ～ 0.3

Applicability and limitations

Original composition for high-strength bolt steel in the Kobe Steel catalogue, section 6-11 (PDF page 31), mass fractions wt%; This is not the original JIS/SAE standard. The catalogue does not state a publication year; supply and process applicability require separate confirmation.

Composition conditions

Original-table mass percentage, Section 6-11; Dashes and unlisted elements are not entered as zero.
The original Ti entry is addition, indicating qualitative addition only, without a numerical range.
The manufacturer catalogue does not identify the publication edition; Catalogue information does not establish current supply dimensions.

Verification notes

The original manufacturer table was checked cell by cell against the PDF table; Qualitative Addition has no numerical lower or upper limit.