Hot Rolled Steel Grades & Applications – A Comprehensive Guide

Steel, an alloy of iron and a small amount of carbon, is engineered into a wide range of grades that differ by carbon content and the addition of other alloying elements such as chromium, manganese, or tungsten. These additives modify key properties—tensile strength, ductility, malleability, durability, and thermal or electrical conductivity—making each grade suitable for specific engineering tasks.

Understanding Hot‑Rolled vs. Cold‑Rolled Steel

Most steel is produced via one of two primary processes: hot rolling and cold rolling. Hot‑rolled steel is shaped at temperatures above 1700 °F (≈927 °C), while cold‑rolled steel is processed at room temperature. Both terms describe manufacturing methods, not individual steel grades.

Hot‑Rolled Steel Process

In hot rolling, heated slabs are passed through a series of rollers, forming long, thin strips. The strip is then water‑cooled and wound into coils. Different cooling rates produce distinct metallurgical properties. Normalizing the steel at room temperature further increases strength and ductility. Typical uses include construction, railroad tracks, and sheet metal where finish quality and tight tolerances are not critical.

Cold‑Rolled Steel Process

After initial hot rolling, cold‑rolled steel undergoes additional annealing or temper rolling to enhance tensile and yield strengths. Though more labor‑intensive, the resulting product offers tighter dimensional tolerances and a smoother finish, making it ideal for structural parts, furniture, appliances, and precision automotive components.

Common Hot‑Rolled Steel Grades

Hot‑rolled steel grades are specified by ASTM or SAE (AISI) standards. Below are the most frequently used grades, their key characteristics, and typical applications.

ASTM A36 – Low‑Carbon Structural Steel

• Carbon: <0.30 % by weight
• Manganese: 1.03 %
• Silicon: 0.28 %
• Copper: 0.20 %
• Phosphorus: 0.04 %
• Sulfur: 0.05 %
• Easy to machine, form, and weld
• Average corrosion resistance due to low chromium and nickel content
• Radiused corners and scaled surfaces from hot‑rolling process
• Cost‑effective for heavy‑duty construction

Industries: bridge construction, automotive, general construction, heavy equipment, oil & gas.

Applications: truck frames, agricultural equipment, shelving, walkways, guard rails, structural support, trailers, general fabrication.

Find a wide selection of ASTM A36 products—angles, bars, beams, channels, tees, and pre‑cut options—at Industrial Metal Supply.

SAE 1018 – Medium‑Carbon Steel

• Carbon: 0.18 %
• Manganese: 0.6‑0.9 %
• Low impurity content compared to A36
• Better strength and hardness for cold‑forming operations

Commonly used in bar or strip forms; the cold‑rolled variant is preferred for many applications.

Typical uses: gears, pinions, ratchets, oil tool slips, pins, chain pins, liners, studs, anchor pins.

SAE 1011 – High‑Strength Low‑Alloy Sheet and Plate

• Supersedes the old ASTM A569 CQ specification (withdrawn 2010)
• Rougher surface than cold‑rolled steel; excellent for galvanizing
• Highly formable and weldable; easy to drill
• Available in standard or P&O (plate & offset) variants
• Increased malleability and high production rates

Applications: building and construction, automotive, shipping containers, roofing, appliances, heavy equipment.

ASTM A513 – Hot‑Rolled Carbon Steel Tubing

• Produced by rolling heated sheet metal into tubes
• Rough surface finish with radiused corners; welded or seamless construction
• Suitable where tight tolerances are not critical
• Easy to cut, weld, form, and machine

Applications: engine mounts, bushings, building construction, automotive components, industrial equipment, solar panel frames, home appliances, aerospace, agricultural machinery.

ASTM A786 – Hot‑Rolled High‑Strength Steel

Optimized for high‑strength applications such as steel tread plates, ideal for flooring and treadways.

SAE 1020/1025 – Medium‑Carbon Structural Steel

Used in construction, engineering, tool and die manufacturing, and machinery parts for automotive and industrial equipment.

Your Trusted Hot‑Rolled Steel Source

Industrial Metal Supply is a leading supplier of ASTM A36 and SAE 1018 hot‑rolled steel products. We offer next‑day delivery and will‑call pickup across six convenient locations.

Call or visit one of our sites to learn more about our hot‑rolled steel inventory or request a quote today.