Steel GP280GH +NT (Normalized and tempered)
Heat-treated state · default condition
EN 1.0625
Standard supply condition for pressure-retaining valve and pump castings; balanced strength, ductility and stress relief.
Values for the +NT condition
Other GP280GH tempers and conditions
GP280GH is listed in 3 conditions; see the grade overview at GP280GH.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Normalized | Basic normalized condition for thin-walled, non-critical castings where a tempering step is not required. | 300 | 530 | 23 | 160 HB | 10 % IACS |
+NTDefaultThis page Normalized and tempered | Standard supply condition for pressure-retaining valve and pump castings; balanced strength, ductility and stress relief. | 310 | 540 | 24 | 165 HB | — |
Quenched and tempered | Choose for heavy-section castings needing uniform properties through wall thickness and higher notch toughness. | 345 | 570 | 24 | 180 HB | — |
What is GP280GH +NT?
GP280GH +NT is GP280GH heat treated to +NT — standard supply condition for pressure-retaining valve and pump castings; balanced strength, ductility and stress relief. GP280GH +NT has a yield strength of 310 MPa (45 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 83% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). GP280GH +NT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
- Readily welded — 78/100, better than 78% of steel grades
Limitations
- Low strength — 310 MPa (45 ksi), worse than 83% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
GP280GH +NT properties
Typical room-temperature values for GP280GH +NT; 16 are specific to this condition. Other listed values are GP280GH reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
GP280GH +NT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
GP280GH +NT has a yield strength of 310 MPa (45 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 83% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
GP280GH +NT is rated for continuous service to 425°C (797 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
GP280GH +NT conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of GP280GH +NT takes about 25 MJ of energy and emits 2.2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 80%.
Manufacturability7
GP280GH +NT's machinability is good (60/100, better than 83% of steel grades); weldability very good (78/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GP280GH +NT
Is GP280GH easy to machine?
Machines like normalized 1020–1025 wrought steel; watch for hard skin, sand inclusions and shrinkage porosity at the casting surface — take a full first cut with tough carbide inserts.
Can GP280GH be welded?
Readily weldable (CE ≈ 0.45) by SMAW/GTAW/SAW with low-hydrogen consumables; preheat 100–150 °C on heavy sections and PWHT 580–620 °C for pressure-boundary repairs.
Can GP280GH be formed, bent or molded?
Supplied as sand or investment castings; use adequate risering and chills to avoid centreline shrinkage, then normalize/temper the whole casting.
What surface finishes work on GP280GH?
No anodizing; protect with shot blast plus epoxy/zinc-rich primer, electroless nickel or hard-chrome on sealing faces for corrosive service.
GP280GH 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 |
|---|---|---|
| CEN 10213-2 | 0.18 – 0.25 | 0.22 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.8 – 1.2 | 1 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Crresidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.12 | 0.05 |
| Niresidual | ≤ 0.4 | 0.15 |
| Curesidual | ≤ 0.3 | 0.15 |
| Vresidual; total residuals ≤ 1.00 % | ≤ 0.03 | 0.01 |
| Fe | balance | — |
GP280GH +NT — frequently asked
What is GP280GH +NT used for?
GP280GH +NT is typically used for high-pressure valve bodies, steam piping fittings and pressure vessel castings. In short: higher-strength WCB alternative; weldable pressure-boundary casting; thinner walls than GP240GH.
What is the yield strength of GP280GH +NT?
GP280GH +NT has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 83% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is GP280GH +NT easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like normalized 1020–1025 wrought steel; watch for hard skin, sand inclusions and shrinkage porosity at the casting surface — take a full first cut with tough carbide inserts.
Can GP280GH +NT be welded?
Yes — weldability is rated very good (78/100). Readily weldable (CE ≈ 0.45) by SMAW/GTAW/SAW with low-hydrogen consumables; preheat 100–150 °C on heavy sections and PWHT 580–620 °C for pressure-boundary repairs.
What surface finishes work on GP280GH +NT?
No anodizing; protect with shot blast plus epoxy/zinc-rich primer, electroless nickel or hard-chrome on sealing faces for corrosive service.
Can GP280GH +NT be formed, bent or molded?
Supplied as sand or investment castings; use adequate risering and chills to avoid centreline shrinkage, then normalize/temper the whole casting.
What is the maximum service temperature of GP280GH +NT?
GP280GH +NT is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10027-2 / material number 1.0625 — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- ASTM A216/A216M (WCB, comparable grade) — ASTM (2021)
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.