ASME SA709 Gr HPS100W High-Performance Steel
ASME SA709 Gr HPS100W High-Performance Steel: Chemistry, Properties & Equivalents
Comprehensive data on ASME SA709/SA709M Grade HPS100W carbon and low-alloy high-strength steel coil, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolling, thermo-mechanical controlled processing (TMCP), quenching and tempering (Q&T), welding, flame/plasma/laser cutting, cold forming (subject to minimum bend radii), machining
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ASME SA709 Gr HPS100W High-Performance Steel Introduction
ASME SA709/SA709M Grade HPS100W is a high-performance structural steel coil designed for bridge construction. It offers exceptional strength and atmospheric corrosion resistance (weathering), eliminating the need for painting in many environments. This quenched-and-tempered or thermo-mechanically processed steel combines a minimum yield strength of 100 ksi (690 MPa) with excellent notch toughness at low temperatures. Its chemistry is precisely controlled to provide improved weldability and fracture resistance, making it suitable for critical welded bridge components. HPS100W bridges achieve longer service life, reduced maintenance, and lighter structures.
ASME SA709 Gr HPS100W High-Performance Steel Chemical Composition
The alloy design of HPS100W balances strength, toughness, and corrosion resistance. Strict limits on phosphorus and sulfur enhance weldability and impact properties. Copper, chromium, nickel, and molybdenum contribute to atmospheric corrosion resistance (weathering) and high strength. Aluminum is added for grain refinement and nitrogen fixation.
| Element | Content (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.20 | Max |
| Manganese (Mn) | 1.10 – 1.50 | |
| Phosphorus (P) | ≤ 0.020 | Max |
| Sulfur (S) | ≤ 0.006 | Max, low S for toughness & weldability |
| Silicon (Si) | 0.30 – 0.60 | |
| Copper (Cu) | 1.00 – 1.50 | Weathering element |
| Nickel (Ni) | 0.65 – 1.00 | Improves toughness and weathering |
| Chromium (Cr) | 0.50 – 0.80 | Weathering and strength |
| Molybdenum (Mo) | 0.40 – 0.60 | Strength and hardenability |
| Vanadium (V) | ≤ 0.08 | Microalloying for grain refinement |
| Aluminum (Al) | 0.010 – 0.040 | Grain refining, nitrogen scavenger |
| Nitrogen (N) | ≤ 0.015 | Max |
| *Others | CE(IIW) shall be in accordance with S91.1 if specified; residual elements per standard |
ASME SA709 Gr HPS100W High-Performance Steel Thermal and Electrical Physical Properties
The following data represent typical values for high-strength low-alloy steel of this class at room temperature. Slight variations can occur depending on exact heat treatment and composition. These values are useful for design calculations involving heat transfer, thermal expansion, and electrical resistance.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | Room temperature (20 °C) |
| Modulus of Elasticity (E) | 205 | GPa | Tension, 20 °C |
| Shear Modulus (G) | 80 | GPa | Calculated, 20 °C |
| Poisson's Ratio (ν) | 0.3 | – | Elastic range, 20 °C |
| Coefficient of Thermal Expansion (α) | 11.7 | 10⁻⁶/K | Mean value between 20 °C and 100 °C |
| Coefficient of Thermal Expansion (α) | 12.5 | 10⁻⁶/K | Mean value between 20 °C and 200 °C |
| Coefficient of Thermal Expansion (α) | 13.2 | 10⁻⁶/K | Mean value between 20 °C and 300 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 20 °C |
| Thermal Conductivity (λ) | 41 | W/(m·K) | At 100 °C |
| Specific Heat Capacity (cₚ) | 475 | J/(kg·K) | At 20 °C |
| Specific Heat Capacity (cₚ) | 540 | J/(kg·K) | At 200 °C |
| Electrical Resistivity (ρₑ) | 0.25 | 10⁻⁶ Ω·m | At 20 °C |
ASME SA709 Gr HPS100W High-Performance Steel Mechanical Properties
The following tensile and impact properties apply to base material in the delivery condition. Specific test piece orientation and location are according to ASME SA709. Bend test requirements ensure adequate formability. Charpy V-notch impact values guarantee low-temperature toughness essential for bridge structures.
| Property | Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (Rp0.2 or ReH) | ≥ 690 [100] | MPa [ksi] | Transverse direction; for thickness t (see standard for exact gauge) |
| Tensile Strength (Rm) | 760 – 895 [110 – 130] | MPa [ksi] | Transverse direction |
| Elongation (50 mm or 2 in) | ≥ 18 | % | Gauge length 50 mm (2 in); specimen: plate-type |
| Elongation (200 mm or 8 in) | ≥ 14 | % | For plates/coils (if tested) |
| Bend Test (Dia = mandrel diameter, t = specimen thickness) | D=2t | For thickness ≤ 25 mm (1 in) | |
| Bend Test | D=2.5t | For thickness 25 – 50 mm (1 – 2 in) | |
| Bend Test | D=3t | For thickness 50 – 100 mm (2 – 4 in) | |
| Charpy V-notch Impact (average min.) | ≥ 35 [26] | J [ft·lbf] | At –23 °C (–10 °F); t ≤ 63.5 mm (2.5 in) |
| Charpy V-notch Impact (average min.) | ≥ 35 [26] | J [ft·lbf] | At –34 °C (–30 °F); t > 63.5 mm (2.5 in) |
| Charpy V-notch Impact (single min.) | ≥ 25 [18] | J [ft·lbf] | Minimum permissible for one specimen, others must meet average |
ASME SA709 Gr HPS100W High-Performance Steel Full Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A709/A709M | Grade HPS100W [HPS 690W] | Technically identical to ASME SA709. Same chemistry and properties. |
| International | ISO/CIE 4950-2 | E690DD (for comparison) | Similar minimum yield, but chemistry differs; not a direct copy. |
| Europe | EN 10025-6 | S690Q (+AR or +M) | Quenched & tempered structural steel; can replace HPS100W if weathering not mandatory; additional corrosion protection needed. |
| Japan | JIS G 3128 | SHY685 (or SHY685N-EX) | High-yield bridge steel; equivalent in strength but chemistry adapted to Japanese weathering practice; verify suitability with producer. |
ASME SA709 Gr HPS100W High-Performance Steel Application Introduction
HPS100W coil is primarily used in welded bridge construction where high strength and weathering properties eliminate the need for painting. It can be cut, formed, and welded using standard procedures with appropriate consumables. Because of its high strength, designers can achieve significant weight savings, reducing foundation costs and seismic loads. It is typically employed in hybrid girders where different strength steels are matched to stress levels.
Product Applications: Steel plate girders, Box girders, Truss bridges (chord and web members), Orthotropic deck plates, Fracture-critical members, Composite bridge beams
Processed into products: Flanges and webs of welded plate girders, Discretely stiffened panels, Cross-frames and diaphragms, Longitudinal and transverse stiffeners, Splice plates and bracing elements, Transition sections between high-strength and conventional steel grades
Application industries: Civil and bridge engineering, Heavy structural construction, Offshore/marine structures (with supplementary coatings), Railway infrastructure
ASME SA709 Gr HPS100W High-Performance Steel Similar or Equivalent Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A709 | Grade 100W (non-HPS) | Similar strength, but lower fracture toughness than HPS; may require higher preheat for welding. |
| Europe | EN 10025-6 | S690QL | Higher toughness version of S690Q; can be substituted for static structural applications if weathering is not required. |
| Europe | EN 10149-2 | S700MC | High-strength thermo-mechanically rolled steel for cold forming; used in structural hollow sections; not intended for bridge weathering requirements. |
| China | GB/T 714 | Q690qNH / Q690qE | Bridge structural steels with y.s. 690 MPa; weathering grades available (NH). Chemistry differs; check equivalence for specific project. |
| Japan | JIS G 3106 | SM570 | Lower yield strength (450 MPa); not a direct substitute but sometimes used in less demanding parts of hybrid girders. |
Notes:
Additional information: HPS100W steel can be produced with a dual certification (e.g., to multiple ASTM/ASME standards). Supplementary requirements of ASME SA709 (e.g., S5 for Charpy testing at lower temperature, S91 for carbon equivalent limits) are frequently specified. Pre-heat and interpass temperatures during welding must be controlled per AWS D1.5 Bridge Welding Code. The weathering characteristics are enhanced in alternating wet/dry cycles and a protective patina develops over time. In continuously wet or submerged conditions, corrosion protection is required as for non-weathering steel. For precise design data, always refer to the latest edition of ASME SA709/SA709M and the project-specific fabrication specifications.
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