Steel SGCC
SGCC is the commercial-quality hot-dip galvanized sheet and coil grade of JIS G3302 — a low-carbon cold-rolled substrate continuously coated with pure zinc, the coating mass given by the suffix code (Z08, Z12, Z18, Z22, Z27).
Values for the HR condition
SGCC tempers and conditions
SGCC is supplied in 4 conditions, soft to hard. HR is the default FabDigit quotes; the values on this page are for it.
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 |
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 |
Supply forms, finishes and certifications
Ways SGCC is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
RS | Regular spangle surface finish | Surface finish |
Galvanized | Hot-dip zinc coated, cold-rolled base, regular spangle, Z12 class… | Coating |
MS | Minimized / zero spangle surface finish | Coating |
U | Untreated / non-passivated, non-oiled surface | Coating |
Z08 | Coating mass class 80 g/m² total, both sides | Coating |
Z12 | Coating mass class 120 g/m² total, both sides | Coating |
Z18 | Coating mass class 180 g/m² total, both sides | Coating |
Z22 | Coating mass class 220 g/m² total, both sides | Coating |
Z27 | Coating mass class 275 g/m² total, both sides | Coating |
What is SGCC?
SGCC is the commercial-quality hot-dip galvanized sheet and coil grade of JIS G3302 — a low-carbon cold-rolled substrate continuously coated with pure zinc, the coating mass given by the suffix code (Z08, Z12, Z18, Z22, Z27). It is used where low-cost sacrificial rust protection plus good punching, shearing and spot welding matter: enclosures, appliance housings, ducting and brackets, at about 250 MPa yield, 330 MPa tensile and 33% elongation. Strength is only the 270 MPa class with no strict yield requirement, the coating fails quickly above 200 °C and in acids or alkalis, welding burns off zinc, and deep-draw formability is below SGCD/SGCE. SGCC 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). SGCC has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 94% of steel grades. Elongation at break is 33% and the elastic modulus is 205 GPa (29.7 Msi).
What is SGCC used for?
- Electrical enclosures and cabinets
- Appliance housings and panels
- HVAC ventilation ductwork
- Brackets and mounting plates
- Roof decking
- Industrial siding
- Light steel framing members
- Cable trays
Advantages
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- Ductile — tolerates forming and impact — 33%, better than 96% of steel grades
- Easy to machine — 68/100, better than 95% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Forms and bends easily — 72/100, better than 88% of steel grades
Limitations
- Hard to polish — 30/100, worse than 100% of steel grades
- Low strength — 250 MPa (36.3 ksi), worse than 94% of steel grades
SGCC properties
Typical room-temperature values for SGCC-HR; bars are the position among steel grades.
Physical3
SGCC 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 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 94% of steel grades. Elongation at break is 33% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SGCC is rated for continuous service to 400°C (752 °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 conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of SGCC 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's machinability is good (68/100, better than 95% of steel grades); weldability excellent (88/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. SGCC is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SGCC
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.
Manufacturability
The process limits FabDigit's quote engine applies to SGCC. Design inside these and the part quotes instantly; outside them it routes to an engineer.
Sheet metal
| Formability | Excellent72 / 100 |
|---|---|
| Weldability | Fair88 / 100 |
| Bendable | Yes |
| Minimum bend radius | 1× thickness |
| Sheet thickness range | 0.5 – 3 mm |
| Spring-back | Moderate |
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 |
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.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Black / Phosphate
Thermal Spray
How much does SGCC cost?
SGCC is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
SGCC — frequently asked
What is SGCC used for?
SGCC 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?
SGCC has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 94% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is SGCC easy to machine?
Reasonably — machinability is rated good (68/100, better than 95% 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 be welded?
Yes — weldability is rated excellent (88/100). 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?
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 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?
SGCC is rated for continuous use to about 400°C (752 °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.
How much does SGCC cost?
SGCC is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in SGCC?
Yes — SGCC 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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.