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NXF ASTM WC-8Co/ISO K30 Size 8in Rotary Speed 80-800 Tungsten Carbide YG8 Alloy Deep Rock Well Drilling Bit /Stone Drilling Bit
2026-09-20 20:28 NXF GROUP
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Product Description
Tungsten Carbide YG8 Introduction
Tungsten Carbide YG8 (WC‑8Co) is a sintered cemented carbide produced by powder metallurgy, consisting of approximately 92 wt% tungsten carbide as the hard phase and 8 wt% cobalt as the ductile binder, with trace grain‑growth inhibitors such as VC or Cr₃C₂ optionally added. Balancing hardness and impact toughness, it features a density of 14.5‑14.9 g/cm³, Vickers hardness (HV30) of 1400‑1850 HV, fracture toughness K₁c of 8‑12 MPa·m¹ᐟ² and transverse rupture strength ranging from 1500‑2500 MPa. Compliant with GB/T 18376 and equivalent to ISO K20‑K30, this grade is widely used for TCI tricone bit inserts, rock‑drilling tools, stamping dies, wear‑resistant components, as well as the machining of cast iron and non‑ferrous metals.
Tungsten Carbide YG8 Alloy Deep Rock Well Drilling Bit /Stone Drilling Bit Introduction
The deep rock well drilling bit / stone drilling bit is a widely‑applied rotary drilling tool for oil‑gas wells, water wells,
mining and geotechnical exploration. It consists of three welded steel leg assemblies, each fitted with a rotating cone mounted with press‑fitted tungsten carbide inserts.
During drilling operations, the three cones revolve together with the drill string and rotate around their own individual axes.
Under axial weight‑on‑bit and rotary force, the tungsten carbide inserts crush and scrape rock formations. Equipped with sealed bearing and pressure‑compensated lubrication system, the bit prevents mud ingress and extends working service life.
Various IADC‑coded models are available to adapt to soft, medium, hard and abrasive rock formations. Featuring reliable
rock‑breaking performance, strong impact resistance and outstanding wear resistance, it is extensively adopted for petroleum drilling, mine exploration, water well drilling and foundation engineering construction.
mining and geotechnical exploration. It consists of three welded steel leg assemblies, each fitted with a rotating cone mounted with press‑fitted tungsten carbide inserts.
During drilling operations, the three cones revolve together with the drill string and rotate around their own individual axes.
Under axial weight‑on‑bit and rotary force, the tungsten carbide inserts crush and scrape rock formations. Equipped with sealed bearing and pressure‑compensated lubrication system, the bit prevents mud ingress and extends working service life.
Various IADC‑coded models are available to adapt to soft, medium, hard and abrasive rock formations. Featuring reliable
rock‑breaking performance, strong impact resistance and outstanding wear resistance, it is extensively adopted for petroleum drilling, mine exploration, water well drilling and foundation engineering construction.
Tungsten Carbide YG8 Alloy Deep Rock Well Drilling Bit /Stone Drilling Bit Drawing
Tungsten Carbide YG8 Chemical Composition And Mechanical Properties
Factory and Product Pictures
Tungsten Carbide YG8 Alloy Deep Rock Well Drilling Bit /Stone Drilling Bit Product Pictures
Tungsten Carbide YG8 PMI spectral testing proves
Video of a customer visiting us
Product processing
Tungsten Carbide YG8 Alloy Deep Rock Well Drilling Bit /Stone Drilling Bit Product Processing
1. Raw Material Inspection：
All raw materials including alloy steel for bit bodies and YG8 tungsten carbide inserts are strictly inspected through spectrum analysis, hardness testing and visual inspection to ensure chemical composition and mechanical properties meet standard requirements.
2. Forging Process：
The bit legs and cones are hot forged under high temperature to refine metal structure, eliminate internal defects, and improve overall strength and impact toughness for harsh rock drilling conditions.
3. CNC Machining：
Precision CNC machining is performed to process bit contour, shaft journal, mud flow channels, oil grooves and assembly holes, ensuring accurate dimensional tolerance and structural consistency.
4. Heat Treatment：
Professional heat treatment including carburizing, quenching and tempering is carried out to harden the working surface while maintaining tough core texture, improving wear resistance and anti-impact performance.
5. Tungsten Carbide Insert Press Fitting：
Precision tooth holes are drilled on the cones. Standard YG8 tungsten carbide inserts are hydraulically pressed into holes by interference fit to ensure firm installation, no falling off during high-load rock breaking.
6. Bearing and Seal Assembly：
High-precision bearings, rubber seals and pressure compensation lubrication components are assembled strictly. The internal lubrication system is installed to prevent mud intrusion and reduce operating friction.
7. Three-Leg Integral Welding：
Three sets of machined leg-cone assemblies are positioned and welded with precise temperature control to avoid thermal damage to internal seals and lubrication structures, ensuring overall bit rigidity.
8. Thread Machining：
Standard API connection threads are precisely processed and calibrated to guarantee accurate connection, smooth assembly and reliable matching with drilling tools.
9. Pressure Testing：
Lubricating grease is filled into the bit interior. Strict pressure tightness testing is conducted to check sealing performance and eliminate leakage risk under downhole pressure.
10. Final Product Inspection：
Comprehensive final inspection including dimension detection, rotation flexibility test, non-destructive flaw detection and appearance inspection is performed. Only qualified products are marked, painted and delivered.
Our NXF GROUP advantage as follow
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
Packing & Delivery
Packing
Delivery
Company Profile
New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories.Established in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and Craftsmanship." Our advantage:3S Service(Small Quantity/Short Time/Special Material)
Certification
FAQ
1.Who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.
2.How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.What can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4.Why should you buy from us not from other suppliers?
Our advantage:
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.
2.How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.What can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4.Why should you buy from us not from other suppliers?
Our advantage:
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
5.What services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
5.What services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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