Physical properties of high carbon ferrochrome
Chromium iron is the most important material in the manufacture of the stainless steel, mainly used in production of stainless steel, bearing steel, tool steel, nitriding steel, refractory steel, quenched and tempered steel, carburized steel and hydrogen resistant steel, this is due to the difference of chromium in stainless steel, decided to properties of stainless steel is only one element, and this is chrome, each kind of stainless steel must contain a certain amount of chromium.
Ferrochrome should be in blocks, each weight should not be more than 15kg, size less than 20×20mm of the weight of the ferrochrome block does not exceed 5% of the total weight of ferrochrome.If the buyer has special requirements on the particle size, the buyer and the buyer shall negotiate separately.
There shall be no visible non-metallic inclusions in the inner and surface of ferrochrome, but a small amount of them may be allowed when the coating on the surface of the ingot is not clean.
Sampling test method: bulk verification sampling: when the batch is less than 10 tons, no less than 10 samples should be randomly taken from different parts;If the batch is more than 10 tons, less than 30 tons, no less than 20 samples should be randomly taken from different parts;When the batch is more than 30 tons, no less than 30 samples should be randomly taken from different parts.Each sample weight should be approximately equal, its lumpiness is not less than 20*20mm.The sampling amount shall not be less than 0.03% of the lot.All samples taken should be broken to less than 10mm and quartered to 1-2kg. After mixing, they should be divided into two equal parts, one for sample preparation and the other for retention.
Package verification sampling: no less than 10% of the package should be randomly selected from each lot.In each piece, a sample with approximately equal weight is randomly taken, and its lumpiness is not less than 20*20mm. There shall be no less than 8 samples and no more than 30 samples.All samples should be broken to less than 10mm, and then quartered to 1-2kg. After mixing, the samples should be divided into two equal parts, one for sample preparation and one for retention.