Hot Rolled, Cold Rolled and Alloy Steel Grades
As part of The Lawton Standard family, Lawton AIABar can support a wide range of metal supply and machining needs. Contact us to learn more about available steel alloy grades, bar stock and precision-machined components.
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Lawton AIABar supplies raw steel bars and rounds along with precision-machined steel parts. Combining material distribution with machining can reduce handling, production time and overall project costs. Instead of coordinating multiple suppliers, customers can source steel stock and finished components through one experienced team.
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| Hot Rolled Steel Bars | |
|---|---|
| Grade | Description |
| ASTM A36 | Low-carbon, general-purpose material for structural applications. Minimum physical properties: 36,000 psi yield strength and 58,000 psi tensile strength. |
| HR Bars 1117 | Low-carbon, high-manganese steel. Used in manufacturing parts requiring considerable machining, close tolerances and a smooth finish. Especially suitable for carburized parts requiring a soft core and high surface hardness. Used for gears, pinions, pins and ratchets. |
| HR Bars 11L17 | 1117 with the addition of .15% to .35% lead, providing improved machinability without changing the excellent case-hardening characteristics of 1117. |
| HR Bars 1045 | Medium carbon steel is used when greater strength and hardness are desired. Can be hammer-forged and responds to heat treatment. Suitable for flame and induction hardening. Used in gears, shafts, axles, bolts, studs and machine parts. |
| HR Bars 1141 | Medium-carbon, special-quality manganese steel with improved machinability and a deeper, more uniform heat-treatment response than plain-carbon steel. |
| Cold Rolled Steel Bars | |
| CR Bars 1018 | Low carbon, medium manganese content. Good hardening properties and fair machinability. Readily brazed and welded. |
| CR Bars 12L14 | Lead-bearing steel with extraordinarily fast machining speeds. Widely used in screw machining work. Has excellent ductility and fine surface quality. |
| Alloy Bars | |
| Alloy Bars 4140 | A through-hardening chromium-molybdenum-carbon steel, not subject to temper embrittlement. It is recommended for heavy-duty service. 4140 has high hardenability, good fatigue, abrasion and impact resistance. It can be successfully nitrided for maximum wear and abrasion resistance. It is a deep-hardening alloy suitable for severe service characterized by fatigue, abrasion, impact, high-temperature stresses or a combination of such stresses in small and large sections. |
| Alloy Bars 4340 | A tough, shock-resisting, oil-hardening nickel-chromium-molybdenum steel. In the heat-treated condition, it has the highest combination of tensile and endurance strengths and ductility. Maintains good strength properties at elevated temperatures. The high-depth hardness is reflected in excellent torque properties. Recommended for heavy-duty, high-strength applications. |
| Alloy Bars 8620 | Most widely used case-hardening alloy steel, with high core strength and toughness. |
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Understanding Steel Alloy Grades
Choosing among different steel alloy grades starts with understanding how composition, processing and heat treatment affect performance. Hot-rolled, cold-rolled and alloy steels each offer different combinations of strength, machinability, ductility, hardness and wear resistance.
Key Factors Influencing Steel Alloy Grades
- Chemical Composition: Carbon content and alloying elements such as manganese, chromium, nickel and molybdenum can influence strength, hardness, toughness and corrosion resistance.
- Processing Methods: Hot rolling, cold rolling, machining and heat treatment affect dimensional accuracy, surface finish and mechanical performance.
- Application Demands: Load, operating temperature, wear, impact and fabrication requirements all influence which steel grade is appropriate.
Common Applications for Steel Alloy Grades
- Structural Applications: ASTM A36 is commonly used where general-purpose structural strength and weldability are needed.
- Machined Components: Grades such as 1045, 4140 and 4340 are used for gears, shafts, axles and other components requiring higher strength or wear resistance.
- Case-Hardened Parts: Grades such as 8620 are well suited for components requiring a hard, wear-resistant surface with a tough core.
- High-Machinability Applications: Grades such as 11L17 and 12L14 are frequently selected when machining speed, dimensional control and surface finish are priorities.
Choosing the Right Steel Alloy Grade
Selecting the right steel alloy grade requires comparing material properties with your project's operating conditions, fabrication requirements and performance goals. Factors such as load, wear, heat treatment, machinability and exposure conditions can help narrow the available options.
Lawton AIABar can help you evaluate available steel grades and determine which material best fits your machining or production requirements.
