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What’s the chemical composition of 8620? Now let us show the 8620 chemical composition.
8620 / 8620H is a low Nickel Chromium Molybdenum case hardening (carburizing) steel. Can Be supplied in “H” condition with controlled hardenability. Strict analytical limits provide controlled response from heat to heat, making it an ideal selection for production case hardened parts, where consistency in heat treatment is required. Typical core strength up to Rc41 Carburised, hardened and tempered.

SAE 8620 Steel Specification and Relevant Standards

ASTM 8620 Steels Equilvalents 8620 chemical composition

APPLICATIONS

This grade finds wide application in the automotive industry and for ring gears, pinions, racks and worms, helical gears, bearing races, pins and high tensile chains.

Otai special supply a range of 8620 material, including 8620 Round Bar, Steel Plate, Square Bar and 8620 tubes.

8620 Round Bar: diameter 8mm – 3000mm
8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
8620 Square Bar: 20mm – 500mm
8620 tubes are also available against your detailed request.

8620 Material description

AISI 8620 is a type of alloy steel, 8620 Material is a case-hardening steel containing nickel, chromium, and molybdenum as alloying elements.
These ingredient elements must be within certain weight percentages to create the 8620 alloys. It takes advantages of good strength and toughness properties and has a higher core strength than grades 8615 and 8617. The equivalent Chinese material of AISI 8620 alloy steel is 20CrNiMo, which is a common material grade in steel forging.
The alloy shows good strength and toughness properties. This alloy may be used in the production of medium-strength parts such as forged camshafts, fasteners, and gears. Extensive surface carving is not ideal for 8620, however, it responds well to polishing.

8620 Material Chemical Composition

Heat Treatment of 8620 Material

1.Annealing: For optimum machinability, an as-forged structure is normally sufficient for this grade of alloy steel. If this proves not to be the case then an iso-anneal from around 1650ºF (900ºC) to 1225ºF (660ºC) will improve machinability.

2.Normalizing: 1675ºF (910ºC) and air cool. This is another method of improving machinability in this grade; normalizing might also be used prior to case hardening.

3.Hardening: The alloy will be austenitized at around 1525ºF (830ºC) and oil or water quenched depending upon section size and intricacy.

4.Tempering: To desired hardness, using temperatures based on past experience, following water or oil quench.

5.Machinability: This grade of alloy is readily machined following suitable cooling from forging or subsequent heat treatment.

6.Weldability: This steel may be welded by normal fusion methods, but prior to carburizing or hardening and tempering.

Application of AISI 8620 Material

AISI 8620 steel forging material is used extensively by all industry sectors for light to medium stressed components and shafts requiring high surface wear resistance with reasonable core strength and impact properties.

Typical applications are: Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts, Ratchets, Sleeves and other applications where it is helpful to have a steel that can be readily machined and carburized to controlled case depths.

8620 application – 8620 steel is widely used, mainly used to manufacture machine parts such as gears, crankshafts, gear rings, etc.

AISI 8620 steel forging material is used extensively by all industry sectors for light to medium stressed components and shafts requiring high surface wear resistance with reasonable core strength and impact properties.

Why 8620 steel is preferred for these machine parts？

When the 8620 alloy is properly carburized — heated to a set temperature and then exposed to an agent containing carbon, a process which adds an extra layer of carbon to the outside of the steel, thereby making it stronger — it is used to make such machine parts as gears, crankshafts, and gear rings. Carburized 8620 alloy is strong and durable, which is why it is preferred for these parts.

AISI 8620 is an alloy carburizing steel when thermally treated develops a hard outer case with a soft ductile core. Carefully controlled proportions of chromium, nickel, and molybdenum are responsible for the extensive use as carburizing alloy steel, with valuable features including extreme surface hardenability and good internal strength. Has minimum distortion and growth characteristics. 8620 has good machinability and responds well to polishing.

8620 Application

Typical applications are Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts, Ratchets, Sleeves and other applications where it is helpful to have a steel that can be readily machined and carburized to controlled case depths.
8620 applications include gears, pinions, cams, cranks, clutch shafts, shafting, axles, tie bars, collets, bushings, heavy-duty pins, bolting, springs, hand tools, die cases, and a multitude of machinery parts and components.

8620 hardness is an important indicator in the mechanical properties of 8620 steel. Understanding the 8620 hardness range that can help us to better understand the properties of 8620 steel and the application fields. The following is the details about 8620 hardness.

8620 is a low alloy case hardening steel which is supplied to American standard SAE 8620 and AISI 8620. 8620 can be carburized, which will achieve a tough core with a hard wear-resistant case. 8620 provides a combination of toughness and wear resistance. 8620 is supplied in either the as-rolled or annealed condition for subsequent case hardening.

So what is 8620 mechanical properties and 8620 hardness?

The most widely used alloy case-hardening steel, which may be carburized and hardened to produce a hard wear-resistant case combined with the core strength of the order of 125,000 psi (862 N/mm2). Uniform case depth, hardness and wear properties with minimum distortion are characteristics of this grade. The steel may also be used, not carburized, in a variety of general applications where a ’20’ carbon alloy is desirable.

The mechanical properties of AISI 8620 alloy steel:                            

8620 Delivery status

Delivery in normalizing, annealing or high tempering or without heat treatment according to your requirements.

Otai special steel is an experienced 8620 steel supplier and has a number of 8620 on sale, the main specifications are as follows:

8620 on sale

Supply Range of AISI 8620 Tool Steel

8620 Steel Round Bar: diameter 1mm – 400mm

AISI 8620 Steel Plate: thickness 1 –500mm x width 200– 1400mm

Steel Block: 210mm x 500-810mm

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

Chemical composition

8620 on sale，We will offer the best sale prices and quality steel. Welcome and contact us.

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AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as-rolled condition with a maximum hardness HB 255max. SAE steel 8620 offers high external strength and good internal strength, making it highly wear-resistant. Let’s introduce 8620 equivalent steel in this article.

AISI 8620 is American Standard steel, its performance and application keep accordance with Germany, Japan, China, British steel industry standard. We would like to introduce such material in this article.

8620 equivalent:

AISI 8620 equivalent steel of Germany standard grade is DIN 21NiCrMo2 and W-Nr 1.6523. Chemical composition comparison as below table

AISI 8620 substitute steel of China standard grade is GB 20CrNiMo. Chemical compostion comparison as below table

AISI 8620 replacement of Japan standard grade is JIS SNCM220. Chemical composition comparison as below table

OTAI  8620 Steel is from top 3 China steel mill, our supply range as follow

8620 Round Bar: diameter 8mm – 3000mm
8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
8620 Square Bar: 20mm – 500mm
8620 tubes are also available against your detailed request.
Surface Finish: Black, Rough Machined, Turned or as per given requirements.

We can provide a series of sizes of 8620 steel, the following are the main 8620 size:

AISI 8620 size Supply Range

8620 Round Bar: diameter 8mm – 3000mm
8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
8620 Square Bar: 20mm – 500mm
8620 tubes are also available against your detailed request.

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

AISI 8620 Alloy steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar, and steel square block. AISI 8620 steel Round bar can be sawn to your required lengths as one-offs or multiple cut pieces. 8620 alloy steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Form of Supply

AISI 8620 alloy steel round bar and flat sections can be cut to your required sizes. 8620 alloy steel ground bar can also be supplied, providing a high-quality tool steel precision ground tool steel bar to your required tolerances. AISI 8620 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes. Welcome and contact us.

8620 carbon steel is widely used in various industrial fields. About 8620 carbon steel, some people may wonder: 8620 is carbon steel or alloy steel? The following is a brief description of 8620 carbon steel.

First, the following are the difference between Carbon and alloy steels：

Carbon and alloy steels are the most basic and most frequently used steels. They normally have small amounts of carbon and alloying elements. Carbon steels are frequently used as is, without heat treatment of any kind, but can be case hardened. Addition of lead or sulfur improves machinability but is detrimental to weldability, heat treatability, and formability. Steel parts that require no special properties or heat treatment often are madeof this type of steel.
Alloy steels have additional alloying elements and carbon added to improve the mechanical properties and hardenability. The alloying elements allow the steel to form carbon or alloy carbides that improve wear and/or toughness when heat treated.

Brief description of 8620 carbon steel：

SAE 8620 is low carbon case carburizing alloy steel, main contents of it are carbon, nickel, chromium, and molybdenum.

8620 is nickel-chromium-molybdenum alloy steel. It is recommended that the steel be hardened by carburization which gives it a tough core and hard, wear resistant surface. Nickel provides good toughness while the chrome and molybdenum increase through hardness and wear resistance. Uses include machine parts as gears, crankshafts, shafts, gear rings. 8620 has good machinability before carburizing.

8620 carbon steel can also be used (uncarburised) as high tensile steel, which when suitably hardened and tempered can be utilized for various applications requiring good tensile strength and reasonable toughness. Prehardened and tempered (uncarburized) 8620 carbon steel can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content.8620 (carburized) is used extensively by all industry sectors for light to medium stressed components and shafts requiring high surface wear resistance with reasonable core strength and impact properties.

8620 carbon steel is extensively used for gears, shafts, crankshafts. Typical uses are Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Splined Shafts, Ratchets, Sleeves, etc.

We can supply a wide range of 8620 steel, include 8620 round bar,8620 plates and 8620 tubes, welcome and contact us.

 Heat treatment tool steel – The proper heat treatment of the steel can significantly increase the mechanical properties such as hardness, strength, toughness and wear resistance. Electroplating is applied for surface treatment, the precision of the mold is improved, the surface is bright, the demoulding is smoother, and the surface luminosity of the finished product is increased. Therefore, in order to prolong the life of the mold and improve the quality, in addition to pre-selecting appropriate mold materials, the selection of the heat treatment method for the mold is extremely important after processing. The following points are explained.

1.Normalization
This heat treatment is designed to eliminate the coarse grain structure generated by high temperature and high pressure processing such as casting, forging, rolling, etc., and to eliminate the internal stress generated by the processing. The method is to heat the work to a temperature of 30-50°C above the abnormal point AC3 or ACm point, so that it is naturally cooled in the air, as shown in Figure 1. The steel for large-scale construction is used, and after the material is forged into a model, normalization treatment is applied.

2. Annealing
Annealing is to soften the steel, adjust the crystal structure, and remove internal stress. The method is to heat to 30 °- 50 ° C above the AC3 or AC1 metamorphic point, after a suitable time, in the furnace or ash cooling. There are two ways to anneal the mold material.

3. Stress relief annealing
The purpose is to remove the internal stress caused by the processing. Suitable for roughing, medium cutting or mold parts requiring quenching. The stress generated by the metamorphosis of the granules in the granules during quenching will increase. Unless the internal stress is first removed to eliminate internal stress, it will cause a large strain and cause quenching and warping. Even if the parts that are not quenched are subjected to a large amount of heavy cutting, without this treatment, the precision of the dimensional change or warpage will occur due to the residual of the machining stress.

4. Spheroidizing annealing
The purpose is to improve the workability, increase the toughness, prevent quenching and cracking, and turn the carbides in the steel into spherical structures.

5. Quenching
The purpose of quenching is to harden the steel and increase its strength. The method is that the steel is heated to about 30°~50°C above the AC3 or AC1 metamorphic point, and after being kept for a suitable time, it is rapidly cooled in the quenching liquid to produce a high hardness Matian iron structure.

The influence of mold steel on standard parts – Relevant experts believe that the application of mold standard parts will become more and more extensive, and the standardization of molds and the application of mold standard parts can greatly affect the mold manufacturing cycle. The use of mold standard parts not only shortens the mold manufacturing cycle, but also improves mold quality and reduces mold manufacturing costs. At the same time, the prospect of fast economic molds is very broad. Since people require molds to have a shorter production cycle, the development of fast and economical molds has attracted more and more attention. For example, various superplastic materials are developed to make molds; simple molds are made of epoxy, polyester or fillers such as metal and glass. This type of mold has a simple manufacturing process, easy control, low shrinkage, low price, and high life. Automobile cover molds can also be made from cement plastic. Medium and low melting point alloy molds, spray molding molds, electroforming molds, precision molds, laminated molds, ceramic blister molds, and light styling and rapid manufacturing using heat-hardened rubber. Rapid economic molds such as low-cost molds will be further developed. Quick changeovers, quick-change punches, etc. will also grow. In addition, the rapid die change device and rapid test mode device technology using computer control and robot operation will also be developed and improved.

Experts believe that the proportion of medium-pressure molds in the mold industry will continue to increase. With the development of lightweight products such as vehicles and motors, there is an increasing demand for the number, life, and complexity of die-casting molds. With the development of plastic-based steel, plastic-based wood and the precision and complexity of product parts, the proportion of plastic molds will continue to increase, and the accuracy and complexity will increase accordingly.