Steel HRS-HR (Hot rolled)
Supply condition · default condition
Cheapest structural condition — pick for weldments, frames, brackets and plate where dimensional tolerance and surface finish don't matter.
Values for the HR condition
Other HRS tempers and conditions
HRS is listed in 3 conditions; see the grade overview at HRS.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot Rolled, Pickled & Oiled | Choose when you want hot-rolled price and gauge but a clean, paint- or weld-ready surface without shot blasting. | 280 | 440 | 26 | 125 HB | — |
HRDefaultThis page Hot rolled | Cheapest structural condition — pick for weldments, frames, brackets and plate where dimensional tolerance and surface finish don't matter. | 285 | 450 | 23 | 130 HB | — |
Cold rolled | Pick for tight thickness tolerance, smooth paint-ready surface and better machined finish; costs more and has less ductility than HR. | 350 | 450 | 18 | 145 HB | — |
What is HRS-HR?
HRS-HR is HRS supplied in the HR condition — cheapest structural condition — pick for weldments, frames, brackets and plate where dimensional tolerance and surface finish don't matter. HRS-HR has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 89% of steel grades. Elongation at break is 23% and the elastic modulus is 200 GPa (29 Msi). HRS-HR 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).
Advantages
- Readily welded — 95/100, better than 97% of steel grades
- Conducts heat well — 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades
- High electrical conductivity — 10.8 % IACS, better than 94% of steel grades
- Forms and bends easily — 65/100, better than 81% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
- Low strength — 285 MPa (41.3 ksi), worse than 89% of steel grades
HRS-HR properties
Typical room-temperature values for HRS-HR; 13 are specific to this condition. Other listed values are HRS reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
HRS-HR 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).
Mechanical16
HRS-HR has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 89% of steel grades. Elongation at break is 23% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
HRS-HR is rated for continuous service to 400°C (752 °F). It conducts heat at 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
HRS-HR conducts electricity at 10.8 % IACS, better than 94% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of HRS-HR takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
HRS-HR's machinability is good (60/100, better than 83% of steel grades); weldability excellent (95/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with HRS-HR
Is HRS easy to machine?
Free and easy at HSS/carbide speeds but gummy — use positive rake, sharp tooling and coolant; expect a poorer finish than cold-rolled or leaded grades and remove mill scale first to protect edges.
Can HRS be welded?
Prequalified for essentially all processes (SMAW/GMAW/FCAW/RSW) with E70/ER70S-6 consumables, no preheat below ~38 mm at RT; grind off scale, oil or zinc coating before welding and ventilate zinc fume.
Can HRS be formed, bent or molded?
Bends and rolls readily cold (min bend radius ≈ 1–1.5 t hot rolled, 0.5–1 t cold rolled); hot-rolled scale can crack and mark dies, and springback is low.
What surface finishes work on HRS?
No anodizing — blast or pickle then prime; typical finishes are phosphate + powder coat/e-coat, zinc plating, hot-dip galvanizing or black oxide/oil for temporary protection.
HRS 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 |
|---|---|---|
| CA36 plate ≤0.26; A1011 CS / Q235B typically 0.12–0.20 | ≤ 0.26 | 0.18 |
| Mnwider range for thicker plate | 0.3 – 1.2 | 0.7 |
| Si0.15–0.40 when silicon-killed | ≤ 0.4 | 0.2 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Cu0.20 min if copper-bearing grade specified | ≤ 0.2 | 0.05 |
| Febalance, residual Cr/Ni/Mo typically <0.1 each | balance |
HRS-HR — frequently asked
What is HRS-HR used for?
HRS-HR is typically used for structural plate and base plates, bracket weldments, welded machine frames and skids, sheet-metal enclosures and panels, formed channels, angles and gussets and machine guards and platform floor plate. In short: workhorse hot-rolled plate.
What is the yield strength of HRS-HR?
HRS-HR has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 89% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is HRS-HR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Free and easy at HSS/carbide speeds but gummy — use positive rake, sharp tooling and coolant; expect a poorer finish than cold-rolled or leaded grades and remove mill scale first to protect edges.
Can HRS-HR be welded?
Yes — weldability is rated excellent (95/100). Prequalified for essentially all processes (SMAW/GMAW/FCAW/RSW) with E70/ER70S-6 consumables, no preheat below ~38 mm at RT; grind off scale, oil or zinc coating before welding and ventilate zinc fume.
What surface finishes work on HRS-HR?
No anodizing — blast or pickle then prime; typical finishes are phosphate + powder coat/e-coat, zinc plating, hot-dip galvanizing or black oxide/oil for temporary protection.
Can HRS-HR be formed, bent or molded?
Bends and rolls readily cold (min bend radius ≈ 1–1.5 t hot rolled, 0.5–1 t cold rolled); hot-rolled scale can crack and mark dies, and springback is low.
What is the maximum service temperature of HRS-HR?
HRS-HR 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 HRS-HR and HRS-CR?
HR is the default condition — cheapest structural condition — pick for weldments, frames, brackets and plate where dimensional tolerance and surface finish don't matter. CR: pick for tight thickness tolerance, smooth paint-ready surface and better machined finish; costs more and has less ductility than HR. Yield strength is 285 MPa in HR versus 350 MPa in CR.
Can FabDigit make parts in HRS-HR?
Yes — HRS-HR is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A36/A36M Carbon Structural Steel — ASTM International (2019)
- ASTM A1011/A1011M Hot-Rolled Sheet and Strip, CS/SS/HSLAS — ASTM International (2018)
- ASTM A1008/A1008M Cold-Rolled Sheet, CS/SS/HSLAS — ASTM International (2021)
- ASTM A653/A653M Zinc-Coated (Galvanized/Galvannealed) Sheet — ASTM International (2020)
- GB/T 700 (Q235B) — SAC / (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Machinery's Handbook, 31st ed. (machinability ratings) — Industrial Press (2020)
- worldsteel LCI data for steel products — World Steel Association (2023)
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.