Wholesale Tungsten Carbide Solid Round Bar Manufacturer & Factory

Vacuum sintering often leaves residual microscopic pores (A04/B04 porosity levels) that act as crack initiation sites under cyclic cutting loads. Sinter-HIP subjects the cemented carbide to simultaneous high temperature and isostatic inert gas pressure (up to 10 MPa) during liquid-phase sintering. This eliminates micropores to A00/B00 ratings, increases Transverse Rupture Strength (TRS) by 15–20%, and prevents catastrophic tool breakage during interrupted milling.

Cobalt acts as the ductile metallic binder for tungsten carbide grains. As Cobalt content increases, toughness increases while hardness and wear resistance decrease. Choose 6% Cobalt for high-abrasion non-ferrous materials (aluminum, graphite, wood); 10% Cobalt (submicron) as a versatile workhorse grade for standard steels and alloy milling; and 12% Cobalt (ultrafine) for hard materials (>52 HRC), stainless steels, titanium alloys, and high-impact interrupted cuts.

Our precision centerless ground solid bars strictly adhere to ISO h6 and h5 diameter tolerances (e.g., +0/-0.008 mm for h6 at 10 mm diameter; +0/-0.005 mm for h5). Surface roughness is held to mirror-like finishes of Ra 0.1 to 0.2 µm, ensuring runout within 0.002 mm. Unground sintered blanks are supplied with a typical grinding allowance of +0.3 to +0.8 mm.

Yes. In addition to standard straight coolant hole bars, we manufacture single, double, and triple coolant passage bars with standard 30° and 40° right-hand or left-hand helix angles. These rods are pre-formed during extrusion to match drill flutes, reducing fluting grinding heat and diamond wheel wear.

Standard stock diameters (1.0 mm to 32.0 mm in 330 mm lengths) have a Minimum Order Quantity of just 1 piece for evaluation. Custom drawing-based preforms, chamfered blanks, or stepped shanks carry low prototype MOQs (typically 5–10 pieces). Standard orders dispatch in 7–25 days from our Jiangxi manufacturing plants.