Technical data for S12C Steel for cold forming, compliant with JIS G4051. View the chemical composition, mechanical properties, and related technical requirements of the current grade.
Supply and technical review · Creation Group accepts supply and technical review enquiries for this product. Dimensions, delivery condition, quantity and inspection documents are confirmed in the order technical agreement after review.
Elements not specified in this table shall not be intentionally added, except where necessary for steelmaking purposes. Note a) May be less than 0.30% upon agreement between supplier and purchaser. b) Upon agreement between supplier and purchaser, the upper limit for Ni + Cr is less than 0.40% for S09CK, S15CK, and S20CK; for other grades, it may also be less than 0.45%.
2. Mechanical properties of wire rod
Mechanical property values shall be determined by agreement between the supplier and the purchaser.
3. Dimensional Tolerances
Table 8 - Dimensional tolerances for hot-rolled wire rod
Diameter
Diameter tolerance
Out-of-roundness a)
<15
±0.3
<0.4
15<d≤25
±0.4
<0.5
25<d≤32
±0.5
<0.6
32<d≤50
±0.6
<0.7
Tolerances for wire rod with a diameter exceeding 50 mm shall be determined by agreement between the supplier and the purchaser. Note a) Out-of-roundness refers to the difference between the maximum and minimum diameters measured on the same cross-section of the wire rod.
TECHNICAL NOTE
Application and ordering note
Chemical composition, mechanical properties, delivery condition and other technical requirements are subject to the currently applicable standard edition, customer drawings and the order technical agreement. Website information does not replace formal quality certification documents.
RFQ CHECKLIST
What to include in the enquiry
Grade and applicable standard
Diameter or section, delivery condition and quantity
Part drawing, forming stations or failure photos, if available
Testing, certificate or report requirements
RELATED CAPABILITIES
Related manufacturing and quality capabilities
Carbon equivalent calculator — S12C
Basis: JIS G4051
Chemical composition source: JIS G 4051:2023
Transcribed from the cited standard
Original source wording
Table 2
IIW / CEV
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15Known-element contribution, not a complete value: 0.1500–0.3233
Missing elements: Mo, V
IIW/CEV: carbon and low-alloy steel weldability screening.
Pcm (Ito–Bessyo)
Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5BKnown-element contribution, not a complete value: 0.1200–0.2200
Missing elements: Mo, V, B
Pcm: mainly low-carbon, low-alloy steels; confirm applicability, particularly when C exceeds 0.11%.
CET
CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40Known-element contribution, not a complete value: 0.1300–0.2400
Missing elements: Mo
CET: ferritic-steel preheat assessment; confirm EN 1011-2 conditions.
A stated upper limit means 0 to that limit. A lower limit alone does not define an upper bound. Missing elements are unknown, not zero. Standard-limit combinations are not measured heat results.
Carbon equivalent supports weldability assessment; it does not approve cold heading, fastener strength or a welding procedure. These formulas do not directly apply to stainless steels, cast irons or non-ferrous metals.
