There are many types of heat-treating fixtures, trays, racks, boxes and other part holders in the market. They are generally castings, wrought fabrications or hybrids.
There are distinct advantages of cast materials over wrought, and there are also distinct advantages of wrought materials over cast.
The most commonly referenced advantages of cast materials are a low cost per unit, the ability to add more of certain beneficial elements such as Cr and C, higher creep strength and the ability to be cast into complex shapes ready to be used.
Wrought alloys, on the other hand, can be used in much thinner sections, are repairable/weldable, resist thermal fatigue better and have better surface finish. The ability to use thinner sections can mean a lower-weight fixture and less BTUs to Heat-treatment Fixture.
Baskets: Wrought and Cast
Baskets are one of the most common heat-treating fixtures. This simple basket, made entirely from wrought round bar, is commonly referred to as a wire-bar basket. This type of basket is used extensively in heat-treating facilities. For small parts like hardware, wire-mesh liners are inserted on all five sides to prevent parts from dropping into the furnace. Facilities will also use fully cast baskets or wrought-cast hybrid baskets.
Cast baskets and hybrids would require more material and therefore result in a heavier fixture. They would be used to support heavier loads than the wrought wire-bar basket can handle.
The wrought basket with lower carbon and a grain structure has good thermal-shock resistance, which means it can be quenched and heated many times, whereas the cast basket will eventually crack from the thermal cycling.
The wrought basket will remain shock-resistant until a case is built up in case-hardening operations. The Heat Treatment Baskets, with their higher carbon, have better creep strength and therefore keep their shape better. However they will show signs of cracking much sooner than wrought. The economics of expected service life and cost per pound to heat treat will be the key factors of the decision.
Heat Fixtures often support heavier parts. This article discusses two traditional types of trays and a newer-design tray. The traditional tray is cast, consisting of straight legs connecting to round tubes.
A serpentine grid has snakelike bent pieces bordered by straight lengths, all held together with threaded round bar with nuts welded to each end. A gap is allowed at one end between the last straight section and the end nut so that the individual pieces can expand and contract freely without constraint.
The serpentine grid can be fabricated from relatively thin sheet. Higher strength can be achieved by increasing the top-to-bottom grid thickness.
The final tray design is a honeycomb pattern made by Duraloy where each leg is relatively thick. As a result, this heavy-duty grid can hold heavier weights than the traditional cast grid. These grids are being seen in more heat-treat shops as a result of their ability to hold a lot of weight.
In both baskets and trays, an important design decision must be made about how thick the supports should be. The thicker the supports, the more weight the Heat Fixtures should be able to hold.
To get the most out of a Heat-treatment Fixture, however, consideration must be given to furnace capacity. Use of a tray with thick support members is not necessarily the best answer because a furnace has a weight-capacity limit.
A Heat Fixtures that is strong enough to support a lot of weight might not be able to do so because the weight of the Heat Fixtures plus the weight of parts it can support is well above furnace capacity.If you can’t run a full load, the strength of the Heat Fixtures is wasted.
We can supply customized casting tray/basket Heat Fixtures. They have the characteristics of long-term high temperature use without deformation (900~1200 °C) and stable bearing capacity.
These materials are especially suitable for vacuum sintering furnaces, vacuum brazing furnaces, vacuum quenching furnaces and other heat treatment industries.
According to the international market, our company has the specifications of flat plate and basket type, which can be processed according to the needs of users.
Heat Resistant Basket for Heat Fixtures
Various kinds alloys, shapes, sizes: round grids, square grids, multiple trays bolted together, reversible/non-reversible, cast-in or bolt-on shoes, pusher/puller sections, customized design for all type of furnace layouts
Regular products like Heat Fixtures, cast baskets, roller rails, cast link belts, chain guides, fans, skid riders, buttons and other furnace parts
Application: for various types of heat treatment furnaces
Process: precision casting/investment casting/sand casting, machining and sand blasting
Materials: high nickel and high chrome heat resistant alloys, cobalt base alloys, like HU, HT, HK, HP, HW, 24/24NbTiZr, 50Cr/50Ni (2.4813), 1.4865, 1.4849, 1.4848, 1.4410, 1.4059, 1.4841, 1.4845, 1.4852, 2.4879 or as per customer’s requirements
Standard: ANSI, ASTM, ASME, DIN, GB
We have in-house facility for each inspection:
Chemical analysis by spectrometer
Mechanical properties testing, yield point, tensile strength, elongation
Non destructive inspection (NDT): X-ray, dye penetrant test, magnetic particle inspection
More than 25 years of professional experience and continuous R&D efforts enable us to offer better custom design and engineering advice
Use only new raw material like nickel plate, chrome iron, cobalt, ferro-tungsten to guarantee physical property and increased service life of our castings
Owned in-house production and inspect facility to guarantee the best quality possible
Experienced workers for foundry, machining and welding guarantee excellent quality and prompt delivery
Focused sales and customer-service team are working with 100% passion to offer you a five-star purchase experience.
The centrifugal casting production line provides Heat Fixtures high temperature alloy furnace tube, conversion tube, radiant tube and furnace bottom roller.
The precision casting production line provides 0.1KG-200KG heat-resistant stainless steel casting. The products include charging tray, charging frame, fan, guide rail, sliding block, hoisting tools, etc
Eternal Bliss Alloy Casting & Forging Co, Ltd.
what’s app:+0086-182 6227 4295