Steel SGHC
JIS SGHC · EN DX51D
SGHC is the Japanese commercial-quality hot-dip galvanized hot-rolled steel sheet, the coated-sheet counterpart to EN DX51D, ordered with coating weights from Z06 through Z27 and in regular, skin-passed, spangle-minimized or chemically treated finishes.
Reference datasheet — SGHC is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
SGHC tempers and conditions
SGHC is supplied in 5 conditions, soft to hard.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Regular (normal) spangle surface finish | Default as-solidified large spangle; cheapest, for unpainted structural use. | 240 | 310 | 32 | 95 HB | 11 % IACS |
Chromate (or Cr-free) passivated surface treatment | Passivated to suppress white rust during storage and shipping. | 240 | 310 | 32 | 95 HB | 11 % IACS |
Annealed | Thin protective oil film for stacking/stamping; must be degreased before painting. | 240 | 310 | 32 | 95 HB | 11 % IACS |
Thermomechanically controlled processed | Fine spangle for a more uniform surface before painting or for visible panels. | 245 | 315 | 31 | 97 HB | 11 % IACS |
Skin-passed (temper-rolled) condition | Temper-rolled to remove yield-point elongation and stretcher strains before forming. | 255 | 320 | 30 | 100 HB | 11 % IACS |
Supply forms, finishes and certifications
Ways SGHC is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CO | Chromate passivated plus oiled | Surface finish |
NSP | Not skin-passed | Surface finish |
ZS | Zero spangle (spangle-free) surface finish | Surface finish |
Z06 | Hot-dip galvanized, 60 g/m² total coating | Coating |
Z08 | Hot-dip galvanized, 80 g/m² total coating | Coating |
Z10 | Hot-dip galvanized, 100 g/m² total coating | Coating |
Z12 | Hot-dip galvanized, 120 g/m² total coating | Coating |
Z18 | Hot-dip galvanized, 180 g/m² total coating | Coating |
Z20 | Hot-dip galvanized, 200 g/m² total coating | Coating |
Z22 | Hot-dip galvanized, 220 g/m² total coating | Coating |
Z27Default | Z27 | Coating |
What is SGHC?
SGHC is the Japanese commercial-quality hot-dip galvanized hot-rolled steel sheet, the coated-sheet counterpart to EN DX51D, ordered with coating weights from Z06 through Z27 and in regular, skin-passed, spangle-minimized or chemically treated finishes. It is used where a zinc layer replaces painting on structural and roofing sheet: 240 MPa yield, 310 MPa tensile, 32 % elongation, 52 HRB and service to 200 °C. The base steel is commercial rather than drawing quality, so deep drawing is limited (formability 77) and zinc vapour lowers weldability (score 54). Choose DX54D or SGCD when severe forming is required. SGHC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). SGHC has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 96% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
What is SGHC used for?
- roofing
- ducting
- appliance housings
- structural panels
Advantages
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Good corrosion resistance — 42/100, better than 98% of steel grades
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- Forms and bends easily — 80/100, better than 93% of steel grades
Limitations
- Hard to polish — 25/100, worse than 100% of steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
SGHC properties
Typical room-temperature values; bars are the position among steel grades.
Physical3
SGHC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical14
SGHC has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 96% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SGHC 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
SGHC conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), better than 98% of steel grades.
Sustainability4
Producing a kilogram of SGHC takes about 28 MJ of energy and emits 2.4 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
SGHC's machinability is good (62/100, better than 89% of steel grades); weldability good (60/100); formability very good (80/100).
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. SGHC is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SGHC
Is SGHC easy to machine?
Soft and gummy — shear, punch or laser-cut rather than machine; use sharp tooling and keep zinc dust/fume controlled, deburr and re-protect cut edges.
Can SGHC be welded?
Resistance spot and MIG/MAG weldable but zinc vapour causes porosity and toxic fume — increase gap/heat input, use forced extraction, and repair welds with zinc-rich paint or spray zinc.
Can SGHC be formed, bent or molded?
Good bending and roll-forming with generous radii (≥1t for thin gauges); avoid deep draws where the hot-rolled commercial-quality base has limited n/r values, and expect some coating powdering at tight radii.
SGHC 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 |
|---|---|---|
| Cbase steel, JIS G3302 commercial quality | ≤ 0.15 | 0.06 |
| Sitypical of DX51D limits | ≤ 0.5 | 0.03 |
| Mn | ≤ 0.8 | 0.35 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.05 | 0.01 |
| Zn coatingcontinuous hot-dip zinc layer, 60–275 g/m² total both sides (Z06–Z27); coating alloy ≥98.5 % Zn with small Al addition | — | |
| Febalance of base steel | balance |
What surface finishes work on SGHC?
Chromate/Cr-free passivation or phosphate pre-treatment before powder coating or PVDF/polyester paint; do not anodize; degrease oiled coils before painting and touch up all sheared edges.
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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel SGHC in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- DX51D
How much does SGHC cost?
SGHC is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
SGHC — frequently asked
What is SGHC used for?
SGHC is typically used for roofing, ducting, appliance housings and structural panels. In short: galvanized commercial-quality sheet; DX51D equivalent; coating replaces paint.
What is the yield strength of SGHC?
SGHC has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 96% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is SGHC easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Soft and gummy — shear, punch or laser-cut rather than machine; use sharp tooling and keep zinc dust/fume controlled, deburr and re-protect cut edges.
Can SGHC be welded?
Yes — weldability is rated good (60/100). Resistance spot and MIG/MAG weldable but zinc vapour causes porosity and toxic fume — increase gap/heat input, use forced extraction, and repair welds with zinc-rich paint or spray zinc.
What surface finishes work on SGHC?
Chromate/Cr-free passivation or phosphate pre-treatment before powder coating or PVDF/polyester paint; do not anodize; degrease oiled coils before painting and touch up all sheared edges.
Can SGHC be formed, bent or molded?
Good bending and roll-forming with generous radii (≥1t for thin gauges); avoid deep draws where the hot-rolled commercial-quality base has limited n/r values, and expect some coating powdering at tight radii.
What is the maximum service temperature of SGHC?
SGHC is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does SGHC cost?
SGHC is a budget-cost steel ($), cheaper than about 90% 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.
Sources
- JIS G 3302 — Hot-dip zinc-coated steel sheet and strip — JSA (2019)
- EN 10346 — Continuously hot-dip coated steel flat products (DX51D) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (zinc coatings) — ASM International (2005)
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.