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10D0525 10D0525 Oil inlet steel pipe for distribution valve; Welding fittings

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10D0507X0 Steel pipe assembly; welded parts

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10D0506X0 Steel pipe assembly; welded parts

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10D0479 ZL30.10.22.1 Three-way steel pipe; welding parts

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10D0473 ZL30.10.23.2 Steel pipe joints; welded parts

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10D0472 ZL30.10.23.1 Steel pipe joints; welded parts

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10D0468 ZL30.10.21.1 Three-way steel pipe; welding parts

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10D0465 ZL50C.30.2.1.3 Steel pipe assembly; welded parts

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10D0412 ZL50CIII.9.3.1 Oil-absorbing steel pipes; welding parts