Steel SGCC-SP
Finish state
SP = skin-passed (temper rolled) after coating
Temper-rolled to flatten coating, suppress stretcher strain (Lüders) lines and set surface roughness for painting.
Values for the SP condition
Other SGCC tempers and conditions
SGCC is listed in 4 conditions; see the grade overview at SGCC.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cold rolled | The annealed cold-rolled substrate SGCC is made from; quoted when the coating is stripped, laser-cut edges dominate, or SPCC-equivalent base properties are needed. | 210 | 310 | 38 | 88 HB | 11 % IACS |
Chemically passivated (chromate or Cr-free) plus anti-finger/oil | Standard shipping condition to prevent white rust in storage; strip or degrease before painting or adhesive bonding. | 240 | 320 | 34 | 95 HB | 10.5 % IACS |
HRDefault Hot rolled | Hot-rolled pickled substrate used for thicker galvanized coil (JIS designates it SGHC); pick for >2 mm ducting and structural brackets where surface finish is secondary. | 250 | 330 | 33 | 102 HB | 10.5 % IACS |
SPThis page Skin-passed (temper rolled) after coating | Temper-rolled to flatten coating, suppress stretcher strain (Lüders) lines and set surface roughness for painting. | 255 | 330 | 32 | 100 HB | 10.5 % IACS |
What is SGCC-SP?
SGCC-SP is SGCC supplied in the SP condition — temper-rolled to flatten coating, suppress stretcher strain (Lüders) lines and set surface roughness for painting. SGCC-SP has a yield strength of 255 MPa (37 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 93% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi). SGCC-SP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F). HR is the default condition FabDigit quotes; SP is available on request or by drawing note.
Advantages
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- Good corrosion resistance — 35/100, better than 97% of steel grades
- Easy to machine — 72/100, better than 97% of steel grades
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- Forms and bends easily — 84/100, better than 94% of steel grades
Limitations
- Hard to polish — 38/100, worse than 98% of steel grades
- Low strength — 255 MPa (37 ksi), worse than 93% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
SGCC-SP properties
Typical room-temperature values for SGCC-SP; 20 are specific to this condition. Other listed values are SGCC reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
SGCC-SP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical16
SGCC-SP has a yield strength of 255 MPa (37 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 93% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SGCC-SP is rated for continuous service to 200°C (392 °F). It conducts heat at 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
SGCC-SP conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of SGCC-SP takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
SGCC-SP's machinability is very good (72/100, better than 97% of steel grades); weldability very good (72/100); formability very good (84/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SGCC-SP
Is SGCC easy to machine?
Rarely machined — punch, laser or plasma cut; use sharp tooling and light lubrication to avoid burrs and zinc pick-up, and expect zinc dust extraction on laser lines.
Can SGCC be welded?
Excellent resistance spot/seam weldability with ~20–30 % higher current and more frequent tip dressing; for MIG use ER70S-6 with wider gap/slower travel to vent zinc, ventilate for zinc-oxide fume, and re-protect welds with zinc-rich paint.
Can SGCC be formed, bent or molded?
Good bending, roll forming and shallow drawing (commercial quality only — use SGCD1/SGCE for deep draws); keep bend radii ≥1t and coating side outward, heavy Z27 coating can powder on tight bends.
What surface finishes work on SGCC?
Do not anodize; degrease and remove passivation oil, then phosphate or Cr-free pretreat before powder coat / PCM paint; cut edges self-heal only a few mm so paint or seal exposed edges in wet service.
SGCC chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CJIS G3302 SGCC ladle analysis limit | ≤ 0.15 | 0.06 |
| Mn | ≤ 0.8 | 0.3 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Zn (coating)hot-dip coating; bath contains 0.15–0.25 % Al for coating adhesion; coating mass per Z-class | ≥ 99 | 99.5 |
| Febase steel balance | balance | — |
SGCC-SP — frequently asked
What is SGCC-SP used for?
SGCC-SP is typically used for electrical enclosures and cabinets, appliance housings and panels, HVAC ventilation ductwork, brackets and mounting plates, roof decking and industrial siding. In short: galvanized commercial coil.
What is the yield strength of SGCC-SP?
SGCC-SP has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 93% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is SGCC-SP easy to machine?
Yes — machinability is rated very good (72/100, better than 97% of steel grades). Rarely machined — punch, laser or plasma cut; use sharp tooling and light lubrication to avoid burrs and zinc pick-up, and expect zinc dust extraction on laser lines.
Can SGCC-SP be welded?
Yes — weldability is rated very good (72/100). Excellent resistance spot/seam weldability with ~20–30 % higher current and more frequent tip dressing; for MIG use ER70S-6 with wider gap/slower travel to vent zinc, ventilate for zinc-oxide fume, and re-protect welds with zinc-rich paint.
What surface finishes work on SGCC-SP?
Do not anodize; degrease and remove passivation oil, then phosphate or Cr-free pretreat before powder coat / PCM paint; cut edges self-heal only a few mm so paint or seal exposed edges in wet service.
Can SGCC-SP be formed, bent or molded?
Good bending, roll forming and shallow drawing (commercial quality only — use SGCD1/SGCE for deep draws); keep bend radii ≥1t and coating side outward, heavy Z27 coating can powder on tight bends.
What is the maximum service temperature of SGCC-SP?
SGCC-SP is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between SGCC-HR and SGCC-CR?
HR is the default condition — hot-rolled pickled substrate used for thicker galvanized coil (JIS designates it SGHC); pick for >2 mm ducting and structural brackets where surface finish is secondary. CR: the annealed cold-rolled substrate SGCC is made from; quoted when the coating is stripped, laser-cut edges dominate, or SPCC-equivalent base properties are needed. Yield strength is 250 MPa in HR versus 210 MPa in CR.
Can FabDigit make parts in SGCC-SP?
Yes — SGCC-SP is available for sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- JIS G 3302 — Hot-dip zinc-coated steel sheet and strip — JSA (2019)
- ASTM A653/A653M — Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process — ASTM (2023)
- Hot-dip galvanized steel sheet (GI) product guide — Nippon Steel (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Zinc Coatings / Performance in Service — American Galvanizers Association (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.