Steel SGCC · supply condition · default condition
Steel SGCC-HR
Properties of the HR condition, compared with the other SGCC tempers.
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.
What is SGCC-HR?
SGCC-HR is SGCC supplied in the HR 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. SGCC-HR 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). SGCC-HR 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).
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 — 70/100, better than 96% 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
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
SGCC-HR properties
Typical room-temperature values for SGCC-HR — 7 properties are specific to this condition; the rest are grade-level values shared by every SGCC temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
SGCC-HR 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).
Mechanical13
SGCC-HR 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-HR 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-HR conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 87% of steel grades.
Sustainability4
Producing a kilogram of SGCC-HR 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-HR's machinability is very good (70/100, better than 96% 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.
Other SGCC tempers and conditions
SGCC is also supplied in 12 other conditions. The full side-by-side table is on the SGCC overview.
- HRDefaultHot-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 MPa yield · 58 HRB
- GalvanizedDefault stocked SGCC condition: CR base + continuous hot-dip zinc, chromate-passivated and oiled, for indoor cabinets, ducts and brackets.240 MPa yield · 55 HRB
- CRThe 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 MPa yield · 50 HRB
Working with SGCC-HR
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-HR — frequently asked
What is SGCC-HR used for?
SGCC-HR 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-HR?
SGCC-HR 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 13 listed tempers.
Is SGCC-HR easy to machine?
Yes — machinability is rated very good (70/100, better than 96% 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-HR 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-HR?
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-HR 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-HR?
SGCC-HR 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-HR?
Yes — SGCC-HR 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.