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        Yangquan valve Limited by Share Ltd

        Consultative:400-003-1469

        Electricity: (0353) 2591440 (0353) 2591441

        (0353) 2590751 (0353) 2590307

        Address: No. 366 new road, Yangquan City, Shanxi Province

        True: (0353) 25914692591781

        Mail code:045000

        E-mail:yqfm@sina.com



        Your current location :Home>Quality>Raw materials
        Quality

        Raw material quality control

        1.pig iron inspection

        Inspection basic

        Valve raw metarial procurement standard:Foundry pig iron(GB718-82)


        Inspection Items

        Visual Inspection

        Lumpiness:3kg-7kg

        Surface:adhesion sand and oil or not

        Section:uniform density,silver color

        Data Validation:checking the supplier’s documents include the mark and component test report or not

        Chemical analysis:Sample draw inspection


        Inspection method

        Raw material should be inspected every batch,the standard as follow:

        One time delivery less than 10T,1sample

        One time delivery between10T to 20T,2samples

        One time delivery more than 20T 3samples

        2.Coke Inspection

        Inspect basic

        Valve raw metarial procurement standard: two coke


        Inspection Items

        Visual Inspection

        Lumpiness:bigger than 50mm,with good uniformity,for 1/10~1/6 of the furnace is best

        Section:grey silver color,less porosity,with metal sounds

        Coke powder:less than 4%(≤400mm)

        Yellow spot: less than 5pcs/100c㎡

        Data Validation:checking the supplier’s documents include the varieties of the requirement and quality date or not

        Chemical analysis:the first batch of the coke should be doing chemical component analysis test every month


        Inspection method:

        Every batch need doing data validation and appearance inspection

        The first batch of the coke doing chemical component analysis test must follow below requirement:

        ≤25T       one sample

        >25T      two samples,the coke will be rejected if one sample is disqualification


        3.Electrolytic copper test

        Inspect basic

        Valve raw metarial procurement standard: pure copper

        Inspection Items

        Checking the supplier’s document include the variety of requirement and quality data or not

        Appearance inspection:whether include the electrode connecting head

        Head face: amaranth metallic luster

        Inspection method:every batch inspected


        4.Valve rod section bar inspection

        Inspection basic

        Based on the material trade mark.specification and the valve in the in the procurement plan raw material

        Purchasing standard:”quality carbon steel” and “heat resistant stainless steel” requirement.

        Inspection Items

        Checking the supplier’s document include the variety of requirement and quality data or not

        Appearance inspection:there is not  surface crack,with or without rust,both ends with or without crack,material clearly marked

        Size inspection:steel rod diameter

        Circular degree homogeneity

        Round steel≤φ50mm,the nominal diameter≥0.5mm

        Round steel>φ50mm,the nominal diameter≥1mm


        Inspection method

        Each brand, each kind of specification, each batch inspection  inspect 20% of them,if unqualified,inspect all.

        5. Outward processing casting inspection

        Inspection basic

        Outward processing cast inspection depend on the product drawing and casting quality degree.

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