drill bit by carbide or steel knot carbide

Cemented Carbide is a hard material used extensively as cutting tool material, as well as other industrial applications. It consists of fine particles of carbide cemented into a composite by a binder metal. Cemented carbides commonly use tungsten carbide (WC), titanium carbide (TiC), or tantalum carbide (TaC) as the aggregate. Mentions of “carbide” or “tungsten carbide” in industrial contexts usually refer to these cemented composites.

Most of the time, carbide cutters will leave a better surface finish on the part, and allow faster machining than high-speed steel or other tool steels. Carbide tools can withstand higher temperatures at the cutter-workpiece interface than standard high-speed steel tools (which is a principal reason for the faster machining). Carbide is usually superior for the cutting of tough materials such as carbon steel or stainless steel, as well as in situations where other cutting tools would wear away faster, such as high-quantity production runs.

———–Reference from https://en.wikipedia.org/wiki/Cemented_carbide

Binder metal in Steel Knot Cemented Carbide is not Co or Ni as usually, is steel. So, more cheaper than cemented carbide with good machining performance after heat treatment process as wear-resistant parts in mechine is a big advantage. It is C. G. Goetze who firstly developed steel knot cemented carbide based on TiC and high speed steel in 1955.

G35 Steel Knot Cemented Carbide


The capability of machinability after heat treatment of GT35 steel-bonded cemented carbide is good. After annealing, it can be ordinary cutting, turning, milling, planning, grinding and drilling by ordinary processing. It also can be even forgedand welded.

Compared with other kind of cemented carbide, lower cost and broad application with good physical and mechanical properties are the most advantage.

High hardness after the hardened process because there are most content of dispersed hard phases with high hardness, wear resistance nearly to high co- base cemented carbides.

Compared with die steel, it’s elastic modulus, wear resistance, compressive strength and flexural strength are more better. Compared with cemented carbide, toughness, self-lubricity, low friction coefficient, and chemical stability is more excellent.


  • 1 mechanical

      After sintering HRC 57;

      After Annealing HRC 49;

      After Quenching HRC 69

  • 2 Flexural Strength     ≥2200MPa
  • 3 Porosity                   A04B00
  • 4 Density                   ≥6.5g/cm3
  • 5 Impact Toughness ≥5.9Nm/cm3

GM steel knot cemented carbide

Carbide cemented is TiC and binder metal is high manganese steel in steel knot cemented carbide being named GM. It can be used in mining industry, agricultural machine, cement industry, oil & gas industry, etc. as breaking hammer, ball mill liner, drill teeth, etc.

The advantage is fallowed:

1 High hardness with high toughness

2 Weldable and castle is good

3 Cost performance is excellent

             TIC           Density          Hardness      Flexural Strength       Porosity          Impact Toughness

            (wt%)        (g/cm3)             (HRA)                   (MPa)                                                  (Nm/cm3)

GM-1    50               ≥6.0                   85                      ≥2800                 A04B00                        ≥13

GM-2    54               ≥5.9                   86                      ≥2600                 A04B00                        ≥12

GM-3    56               ≥5.8                   87                      ≥2400                 A04B00                         ≥12

GM-4    59                ≥5.7                  88                      ≥2200                 A04B00                         ≥10

GM-5    63                ≥5.6                 88.5                    ≥1800                 A04B00                         ≥10

GM-6    67                ≥5.5                  89                      ≥1800                 A04B02                         ≥10

GM-7    72                ≥5.4                  90                      ≥1800                 A04B02                          ≥9

                             Size of column                                                   Size of bulk

Diameter (mm)               Length (mm)            Length (mm)        Width (mm)       Height (mm)

           10                          40, 50, 60, 70                      40                         30                          20

           16                         30, 40, 50, 60                       40                         30                          30

           18                      30, 40, 50, 60, 70                    50                         30                          20

           20                30, 35, 40, 45, 50, 55, 60             60                         30                          20

           24               25, 30, 35, 40, 45, 50, 55              60                         30                          30



Stainless base steel knot cemented carbide

Binder metal                 Hardness                    Density, g/cm3          Flexural strength, MPa

Austenite    ST50          HRA 87.5                           6.0                                     1800

  (316L)       ST60          HRA 90                               5.7                                     1500

Martensite           sintering    quenching                6.0                                      2300

(17-4PH)               HRC 50        HRC 68