specification:
1.low cost, high working temperature with good corrosion resistance
2.grades:y10t,y20,y25,y30,y30bh,y35(china standard);c1,c5,c8,c11(u.s.a. standard) hf8/22- hf24/3(europe standard)
3.products manufactured according to iso9001 system;
4.coating: no
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