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Some tips for purchasing manganese steel parts （2）

Are crusher liner test certificates available?

A good test of a supplier’s commitment to their customers is the ability to provide test certificates. Crusher wear liners do not roll off an automatic assembly line and their manufacture to a consistent standard is important for the end-user. The manufacturer must have procedures, practices, and checks in place for this to occur and be able to support its commitment with relevant documentation in the form of test certificates. Qiming Casting is accredited under International Quality Standard ISO 9001: 2008 with the commitment to provide test reports on request and support its liner end-users with a customer service report to assist with all issues raised.

In order to let customers test our product quality, we carried out test order payments. When you are the first time play order to us, you just need pay 30% as pre-payment,40% when we start to send the goods, the rest we can pay after you used.

Surely, we also welcome the third test whichever you choose, and we also will supply you with the test certificates:

Chemistry.
Dimensional inspection.
Heat treatment.

Chemistry reports must include the main elements of carbon and manganese, along with residual elements that can occur as deliberate additions or unintentional additions from melting recycled scrap or a carryover from previous melts in the foundry. It is important that the supplier can explain the effects of the residual elements present and the relationship between carbon and manganese levels.

Dimensional inspection is important at the manufacturing stage to ensure the liner will fit the crusher. If not supplied with the liner, it should be available if requested. Heat treatment reports can be subjective and the reporting of heat times and temperatures does not mean the material properties have been met. A simple check is a magnetic test. Austenitic manganese steel only achieved with correct chemistry and heat treatment is non-magnetic. This can be determined by holding a magnet to the surface of the liner where the surface oxidized layer has been removed by grinding one to two millimeters. An attraction to the magnet will indicate unsatisfactory heat treatment and should be investigated. Should subsequent cracking or premature failure occur, the cause can best be determined from a metallurgical examination?

What should the end-user look for when receiving new crusher liners?

New crusher liners supplied for your crusher are usually supplied neatly painted and standard packed for a good presentation. An initial visual inspection is usually all that is possible and provided there are no surface imperfections present the liner is stored for later use. There are a number of simple checks that can be made:

a. Cone liners are manufactured as casting in two sections, the inner surface, and the outer surface. For a bowl liner, the inner surface is the crushing face and the outer surface is the fitting face and for the mantle, this is the opposite. It is important that for each liner these surfaces are concentric and the best way to ensure this is for the manufacturer to machine both faces. This requires only a light skim on the large end wear the face of each liner and fine crushing is particularly relevant to obtain an accurate closed side setting at start-up.

b. The supplier part number and foundry cast number (or heat number) should be cast or at least stamped on a non-wearing surface of each liner and that number should match the delivery docket supplied with the liner. A supplier operating under a certified quality management system will have full traceability through all phases of manufacture through to liner disposal after use. Should a problem occur during the service life of the liner the end-user must be in a position to refer back to test reports even if not requested with the initial supply.