pipe mould:steel tube, plum tube, flat tube, oval tube, fan-shaped tube, polygonal tube, single and double groove ... tube, polygonal tube, single and double groove pipe, tube frame, special-shaped mould, etc.5. Specification range for ... -63HRC.9. Selection: To produce first-class pipe mould, we must have first-class raw material. We ... not exceed ±0.05mm. High Hardness Welding Mould Roll for SS Tube