Alloy Steel

*Always consult your Heat Treater*
*Information Provided is General*

4140ANN is a widely used quenched and tempered medium carbon alloy steel. 4140ANN is oil-hardening steel of relatively high hardenability. The chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. The grade is especially suitable for forging because they have self-scaling characteristics, respond readily to heat treatment, and are comparatively easy to machine in the heat-treated condition.

4140ANN maintains their properties even after long exposure at relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled good ductility, and the ability to resist street at elevated temperatures, it is understandable why these are widely used and highly successful alloy steels.

4140ANN is excellent for tooling and maintenance applications and numerous machine component parts. The countless applications include backup and support tooling, die details, short run dies, arbors, spindles, brake dies, axles, bolts, forming rolls, and other machine tool components. This heat-treated medium carbon alloy has every requisite for all around good service in applications requiring wear resistance toughness, high mechanical properties, and good machinability.

4140ANN has 0.02 less carbon than 4140/42PH.

The 4140ANN that Windsor Steel Corporation has in stock is an annealed materials versus the 4140/42PH which is a pre-heat treated material.

Hardening happens between 1525 – 1625°F.

*Always consult your Heat Treater*
*Information Provided is General*

4140/42PH is a widely used quenched and tempered medium carbon alloy steel. 4140/42PH is an oil-hardening steel of relatively high harden ability. The chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. The grade is especially suitable for forging because they have self-scaling characteristics, respond readily to heat treatment and are comparatively easy to machine in the heat-treated condition.

4140/42PH maintains their properties even after long exposure at relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled good ductility, and the ability to resist street at elevated temperatures, it is understandable why these are widely used and highly successful alloy steels.

This pre-hardened steel has a hardness of Brinell 262-311, 26-32 RC. 4140/42PH is excellent for tooling and maintenance applications and numerous machine component parts. The countless applications include backup and support tooling, die details, short run dies, arbors, spindles, brake dies, axles, bolts, forming rolls, and other machine tool components. This heat-treated medium carbon alloy has every requisite for all around good service in applications requiring wear resistance toughness, high mechanical properties and good machinability.

4140/42PH has 0.02 more carbon than 4140ANN.

The 4140/42PH stock is pre-heat treated versus the 4140ANN, which is annealed.

Hardening happens between 1525 – 1625°F.

*Always consult your Heat Treater*
*Information Provided is General*

4340 is a chromium nickel molybdenum alloy that is widely used for deep hardening constructional steel. It is used at a variety of strength levels and at each level possesses remarkable toughness and ductility. 4340 material with its high alloy content, uniform hardness is developed by heat treatment in relatively heavy sections. High fatigue strength makes E-4340 material ideal for highly stressed parts. 4340 material maintains its strength and hardness at elevated temperatures.

4340 material is available as electric furnace vacuum degassed steel to meet the high aircraft quality standards of AMS 2301. Thus, 4340 is suitable for the fabrication of parts, which may be subjected to magnetic particle inspection.

4340 material is also available as a Premium Aircraft Quality product. The regular aircraft quality material is remelted in a vacuum using consumable electrode practice. This results in a much cleaner steel the magnetic particle test requirements of AMS-2300 and insures a steel of the highest quality with excellent transverse ductility and toughness at high strength levels.

4340 material applications are intended for parts with sections 3 ½” or less in thickness at the time of heat treatment, which require a through-hardening steel capable of developing minimum hardness of RC 30.

*Always consult your Heat Treater*
*Information Provided is General*

8620 is a “triple alloy” carburizing material. The nickel properties imparts good toughness and ductility, and the chromium and molybdenum contribute increased hardness penetration and wear. 8620 material is readily carburized, and the well-balanced alloy content permits hardening to produce a strong, tough core and high case hardness. 8620 material has excellent machinability and responds well to polishing operations. Because of the fine combination of properties that may be developed, as well as the ease with which it may be processed, this material is ideal for a wide variety of applications.

In the leaded analysis, machinability is improved without the sacrifice of other desirable properties, with the exception that the use of this material is not recommended for applications over 400°F, since at elevated temperature ductility is low.

8620 material is easily welded by any of the common welding procedures, with the rod to be used dependent upon the section, design, service requirements, etc. Preheating and stress relieving is recommended. When welding leaded material (86L20). Adequate ventilation should be provided to prevent accumulation of fumes.

The combination of properties makes 8620 material an ideal choice for a variety of applications such as gears, pinions, spline shafts, piston pins, oil pump piston rods and liners, cams, oil tool slips, gauges, jigs, plastic molds, jaws, etc.