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Chemical Composition of ACI Heat Resisting Stainless Steel

ASTM standard ASTM A297, ASTM A351, ASTM A743, ASTM A744 and ASTM A890 specify castings for corrosion and heat-resisting service. The grade designations used in these standard are those originally developed by the ACI, the Alloy Casting Institute. (Now the Steel Founder's Society of America). These standards include the 'C' grades for aqueous (wet) corrosion service at temperatures

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Heat Temper Colours on Stainless Steel Surfaces Heated in Air

The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation

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Normalizing Normalising of Gray iron

Gray iron is normalized by being heated to a temperature above the transformation range, held at this temperature for a period of about 1 hour per inch of maximum section thickness, and cooled in still air to room temperature. Normalizing may be used to enhance mechanical properties, such as hardness and tensile strength, or to restore as-cast properties that have been

By |2023-11-30T04:01:27+00:0030 11 月, 2023|Categories: Products technical|Tags: , |0 Comments

Stress Relieving Heat Treatment for Austenitic Stainless Steel

Unlike martensitic stainless steel, the austenitic stainless steel are not hardenable by heat treatment as no phase changes occur on heating or cooling. Softening is done by heating in the 1050/ 1120C range, ideally followed by rapid cooling. This is of course the complete opposite to martensitic steel, where this sort of treatment would harden the steel. Apart from inter-stage annealing

By |2023-11-30T03:58:18+00:0030 11 月, 2023|Categories: Products technical|Tags: , , |0 Comments

Induction Hardening

Gray iron castings can be surface hardened by the induction method when the number of castings to be processed is large enough to warrant the relatively high equipment cost and the need for special induction coils. Considerable variation in the hardness of the cast irons may be expected because of a variation in the combined carbon content. A minimum combined

By |2023-11-30T03:55:56+00:0030 11 月, 2023|Categories: Products technical|Tags: |0 Comments

Flame Hardening

Flame hardening is the method of surface hardening most commonly to gray iron. After flame hardening, a gray iron casting consists of a hard, wear-resistant outer layer of martensite and a core of softer gray iron, which during treatment does not reach the At transformation temperature. Both unalloyed and alloyed gray irons can be successfully flame hardened. However, some

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Austenitizing

In hardening gray iron, the casting is heated to a temperature high enough to promote the formation of austenitic, held at that temperature until the desired amount of carbon has been dissolved, and then quenching at a suitable rate. The temperature to which a casting must be heated is determined by the transformation range of the particular gray iron of which

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Martempering

Martempering Marquenching is not actually a tempering procedure, hence the term "marquenching". It is a form of isothermal heat treatment applied after an initial quench of typically in an oil or brine solution at a temperature right above the "martensitic start temperature". At this temperature, residual stress within the material are relieved and some bainite may be formed from

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Austempering

In austempering, the microstructural end product of the gray iron matrix formed below the pearlite range but above the martensite range is an acicular or bainitic ferrite, plus varying amounts of austenitic depending on the transformation temperature. The iron is quenching from a temperature above the transformation range in a hot quenching bath and is maintained in the bath at constant temperature until

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Stainless Steel for Spring Application

Stainless Steel for Spring Application | Heat Treatment of Stainless Steel for Spring Application European standard now cover both stainless steel strip and wire for springs. EN 10151:2002 applies to strip and replaces BS5770 part 4:1981, which is now withdrawn. EN 10272-3:2001 applies to wire and replaces BS2056:1981. Both standards use the European steel grade number system, most

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