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ZK23CrNi3Mo hexagonal hollow steel for rock drill rods

Brazing rod is widely used in a variety of projects such as underground pit mining, open pit mining, road building and tunnel construction. It is an indispensable tool for rock drilling and drilling. The quality of brazing rods depends on many factors such as steel grade, heat treatment process, structural design of brazing rods, transition between different sections, and even the size of transition arc. Among them, the heat treatment of the brazing rod is the main cause of low life or early failure of the rod among the above-mentioned factors. The correct choice of brazing rod heat treatment process will effectively improve the quality and service life of our brazing rod products, reduce consumption, and contribute to the improvement of comprehensive social benefits. To maximize the strength and extend the life of the rod, the only way out is to always ensure high quality brazing steel. Experience tells us that the only way to ensure the quality of brazing steel is to carefully select the raw materials and to take each step of the brazing steel rolling process seriously.

Chemical composition of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

Brand C Si Mn Cr Mo Ni P S Cu
ZK23CrNi3Mo 0.19-0.27 0.15-0.40 0.50-0.80 1.15-1.45 0.15-0.40 2.70-3.10 ≤0.025 ≤0.025 ≤0.25

Dimensions of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

Nominal Size Specification code Distance to side mm Core hole diameter mm
19 H19 19.0 6.0
22 H22 22.2 6.7
25 H25 25.3 7.6
28 H28 28.6 8.8
32 H32 32.0 9.5
35 H35 35.3 9.5

Hardness of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

Brand Hardness HRC
ZK23CrNi3Mo 26-44
Delivery Status: Hot rolled

Length of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

1 Hollow steel usually has a length of 6 000 mm to 7000 mm

2 The hollow steel can be delivered in short lengths by mutual agreement between supply and demand.

3 The allowable deviation of the total length is 0~+60 mm when delivered in fixed or multi-length.

Hexagonal hollow steel profile for ZK23CrNi3Mo rock drill rods

1 Core hole does not allow sharp corners (radius of sharp corners <0.5 times the radius of the core hole) or obvious deformities appear, size outside the range of hollow steel can be delivered without affecting the user’s use

2 hollow steel curvature per meter is not more than 2mm, the total curvature is not more than 0.2% of the total length

3 Large size hollow steel end should be straight

4 Hexagonal hollow steel corner radius r value is for reference only, not as a delivery basis

5 Hexagonal hollow steel out of roundness is not greater than 0.5 times the outer diameter size tolerance

6 hexagonal steel of the same section on any two sides of the difference between the distance, shall not be greater than the tolerance of the size of the opposite side

Surface quality of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

1 Hollow steel surface should not have cracks, scars, inclusions, folding and other defects. Local defects on the surface should be removed, the depth of removal from the basic size (H or D) should be no greater than the allowable deviation of the size. Depth less than half of the size of the allowable difference of individual scratches, indentations, pockmarks may not be removed

2 Hollow steel core hole surface should not have cracks, folding and other missing circuit

3 Hollow steel should have no obvious twist

Quality inspection of hexagonal hollow steel for ZK23CrNi3Mo rock drill rods

1 Chemical composition

2 Decarburized layer

3 Hardness

4 Shape and size

5 External surface quality

6 Inner surface quality

Hexagonal hollow steel decarburization layer for ZK23CrNi3Mo rock drilling rods

The depth of decarburization layer (ferrite + 1/2 transition layer) on one side of the outer surface of hollow steel should be no more than (0.15+1.0%H(D))mm when the basic size is not more than 25.3 mm; when the basic size is more than 25.3 mm, it should be no more than 1.0%H(D) mm

We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.

What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:

  • Oil and Gas Pipeline Construction
  • Onshore and Offshore
  • Boiler Manufacturers
  • Oil Refining Equipment
  • Petroleum and Chemical Plant Construction
  • Fire Protection
  • Heating & Air Conditioning

Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.

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    ShunFu Metal is proud to provide each of our customers with a quality experience, both with products and customer service. Every product is made under strict quality control system.