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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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