Project Description
TWZ-4 Non-Magnetic Drill Collar Steel
Premium Quality from SHUNFU METAL
Steel Grade Introduction and Applications
TWZ-4 non-magnetic drill collar steel represents the pinnacle of metallurgical engineering for oil and gas drilling operations. As a leading manufacturer, SHUNFU METAL specializes in producing this high-performance alloy that meets the most demanding requirements of modern drilling applications. The TWZ-4 grade is specifically designed to provide exceptional non-magnetic properties while maintaining superior mechanical strength and durability.
This specialized steel grade finds extensive application in directional drilling, measurement while drilling (MWD), and logging while drilling (LWD) operations where magnetic interference must be minimized. SHUNFU METAL’s TWZ-4 drill collar steel ensures accurate compass readings and reliable downhole instrumentation performance, making it indispensable for precision drilling operations in both onshore and offshore environments.
Primary Applications
The TWZ-4 non-magnetic drill collar steel manufactured by SHUNFU METAL serves critical functions in various drilling scenarios including deep water exploration, horizontal drilling, extended reach drilling, and complex well trajectories. Its non-magnetic properties are essential for maintaining the accuracy of magnetic surveying instruments and ensuring precise wellbore positioning. The steel’s exceptional strength-to-weight ratio makes it ideal for demanding drilling conditions where both performance and reliability are paramount.
SHUNFU METAL offers two distinct variants: TWZ-4HS (solution treated + warm forged) and TWZ-4LS (solution treated), each tailored for specific operational requirements. These grades provide drilling engineers with flexibility in selecting the optimal material properties for their particular drilling challenges while ensuring consistent quality and performance standards.
Chemical Composition
SHUNFU METAL’s TWZ-4 non-magnetic drill collar steel features a carefully balanced chemical composition designed to achieve optimal non-magnetic properties while maintaining exceptional mechanical performance. The precise control of alloying elements ensures consistent quality and reliable performance in demanding drilling applications.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| Content (%) | ≤0.03 | ≤0.50 | 8.0-10.0 | ≤0.030 | ≤0.020 | 17.0-19.0 | 3.5-5.5 | 0.75-1.50 |
Manufacturing Process
SHUNFU METAL employs advanced smelting methods including electric furnace or converter smelting followed by refining and electroslag remelting (ESR). This sophisticated process ensures exceptional cleanliness, homogeneity, and consistent properties throughout the material. The forging ratio of no less than 6:1 guarantees optimal grain structure and mechanical properties, while ultrasonic testing of each forged piece ensures the highest quality standards.
Available Types from SHUNFU METAL
TWZ-4HS (Solution Treated + Warm Forged)
This premium grade from SHUNFU METAL combines solution treatment with warm forging to achieve superior mechanical properties. The warm forging process enhances grain structure refinement, resulting in improved toughness and fatigue resistance. Ideal for high-stress drilling applications where maximum performance is required.
TWZ-4LS (Solution Treated)
The solution-treated variant offers excellent non-magnetic properties with reliable mechanical performance. SHUNFU METAL’s TWZ-4LS provides consistent quality for standard drilling operations while maintaining the essential non-magnetic characteristics required for accurate downhole measurements.
Both types manufactured by SHUNFU METAL undergo rigorous quality control processes to ensure compliance with international standards and customer specifications. Our advanced heat treatment facilities and quality assurance protocols guarantee consistent performance across all production batches.
Mechanical Properties
SHUNFU METAL’s TWZ-4 non-magnetic drill collar steel exhibits exceptional mechanical properties that make it suitable for the most demanding drilling conditions. The carefully controlled composition and advanced processing techniques result in superior strength, toughness, and fatigue resistance.
| Grade | Tensile Strength σb (MPa) | Yield Strength σ0.2 (MPa) | Elongation δ5 (%) | Reduction of Area ψ (%) | Impact Energy Akv (J) |
|---|---|---|---|---|---|
| TWZ-4HS | ≥758 | ≥551 | ≥35 | ≥65 | ≥150 |
| TWZ-4LS | ≥689 | ≥482 | ≥35 | ≥65 | ≥150 |
Magnetic Properties
The critical magnetic property of SHUNFU METAL’s TWZ-4 steel is its exceptional non-magnetic characteristic. When subjected to a magnetic field intensity of 1×10⁵/4π A/m, the relative magnetic permeability (μr) remains ≤1.008, ensuring minimal magnetic interference with downhole instrumentation and surveying equipment.
Quality Assurance
Every piece of forged material undergoes comprehensive ultrasonic testing along its entire length to detect any internal defects. SHUNFU METAL’s stringent quality control ensures that each drill collar meets or exceeds industry standards for critical drilling applications.
Available Sizes and Specifications
SHUNFU METAL offers an extensive range of TWZ-4 non-magnetic drill collar sizes to meet diverse drilling requirements. Our comprehensive size options ensure compatibility with various drilling systems and operational needs.
| Drill Collar Code | Outer Diameter (inches) | Inner Diameter (inches) | Length (ft) | Chamfer Diameter (inches) | Bending Strength Ratio |
|---|---|---|---|---|---|
| NC23-31 | 3 1/8 | 1 1/4 | 30 | 3 | 2.57:1 |
| NC26-35 | 3 1/2 | 1 1/2 | 30 | 3 17/64 | 2.42:1 |
| NC31-41 | 4 1/8 | 2 | 30 or 31 | 3 61/64 | 2.43:1 |
| NC35-47 | 4 3/4 | 2 | 30 or 31 | 4 33/64 | 2.58:1 |
| NC38-50 | 5 | 2 1/4 | 30 or 31 | 4 49/64 | 2.38:1 |
| NC44-60 | 6 | 2 1/4 | 30 or 31 | 5 11/16 | 2.49:1 |
| NC50-70 | 7 | 2 1/4 | 30 or 31 | 6 31/64 | 2.54:1 |
| NC70-100 | 10-11 | 3 | 30 or 31 | 9 11/32 – 10 1/2 | 2.81:1 – 2.84:1 |
Custom Manufacturing Capabilities
SHUNFU METAL maintains regular inventory of standard sizes and welcomes inquiries for immediate pricing and availability. We also accept custom orders and invite you to consult with our technical team regarding specific dimensional requirements and manufacturing capabilities.
Contact SHUNFU METAL today to discuss your specific requirements and receive competitive pricing for both standard and custom TWZ-4 drill collar solutions.
Technical Specifications and Quality Standards
Manufacturing Standards
SHUNFU METAL adheres to the highest international manufacturing standards for TWZ-4 drill collar production. Our facilities are equipped with state-of-the-art equipment for electric furnace smelting, refining, and electroslag remelting processes. Each production batch undergoes comprehensive testing to ensure compliance with API specifications and customer requirements.
Quality Control Process
Every drill collar manufactured by SHUNFU METAL undergoes rigorous quality control including full-length ultrasonic testing, magnetic permeability verification, mechanical property testing, and dimensional inspection. Our quality assurance system ensures consistent performance and reliability across all products.
Tolerance and Precision
SHUNFU METAL maintains strict dimensional tolerances in TWZ-4 drill collar manufacturing. Inner diameter tolerance is maintained at +1/16″ to 0″, length tolerance at ±6 inches, and chamfer diameter tolerance at ±1/64 inch. These precise tolerances ensure optimal performance and compatibility with drilling equipment systems.
Certification and Documentation
All TWZ-4 drill collar products from SHUNFU METAL are supplied with comprehensive material certificates including chemical composition analysis, mechanical property test results, magnetic permeability verification, and ultrasonic testing reports. Our documentation ensures full traceability and compliance with industry standards and customer specifications.
Why Choose SHUNFU METAL for TWZ-4 Drill Collar Steel
Advanced Manufacturing
State-of-the-art facilities with electroslag remelting technology
Quality Assurance
Comprehensive testing and certification for every product
Custom Solutions
Flexible manufacturing for specific customer requirements
Technical Support
Expert engineering support and consultation services
SHUNFU METAL is committed to providing superior TWZ-4 non-magnetic drill collar steel solutions that meet the evolving needs of the global drilling industry. Our combination of advanced technology, quality manufacturing, and customer service excellence makes us the preferred partner for critical drilling applications worldwide.
Contact SHUNFU METAL Today
Ready to discuss your TWZ-4 drill collar requirements? Contact our technical sales team for detailed specifications, pricing, and delivery information. SHUNFU METAL is your trusted partner for premium non-magnetic drill collar steel solutions.
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.
