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Thread Rod Chinese Manufacturer
QS Fastener: Thread Rod Chinese Manufacturer
Name: Thread Rod Chinese Manufacturer
Material: NiGr23Fe
Product Grade: A
Size: M6 to M100
Length: 30 to 800 mm
Standard: ANSI, DIN, NF
Strength of Extension: 650 N/mm²
Feature: Excellent Oxidation Resistance at High Temperatures
Price: USD 69/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: For Thermal Treatment Plant
Material: NiGr23Fe
Product Grade: A
Size: M6 to M100
Length: 30 to 800 mm
Standard: ANSI, DIN, NF
Strength of Extension: 650 N/mm²
Feature: Excellent Oxidation Resistance at High Temperatures
Price: USD 69/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: For Thermal Treatment Plant
Quantity
As a specialized fastening solution for extreme thermal environments, this Thread Rod is manufactured from NiCr23Fe (DIN W.Nr.2.4851), a nickel-based superalloy known for its outstanding oxidation resistance and mechanical stability at elevated temperatures. Rated as Grade A, it is available in diameters from M6 to M100 and cut lengths between 30 mm and 800 mm, complying with ANSI, DIN, and NF standards. With a minimum tensile strength of 650 N/mm² and a unit price of USD 69/kg, it offers a cost-effective alternative to many Western-made equivalents, particularly when sourced directly from a reliable Chinese Manufacturer who supports low MOQs (10 kg) and fully customizable dimensions, with lead times ranging from 7 to 30 days. Primary applications include thermal treatment plants, gas turbine components, and industrial furnace construction.
Critical Heat Treatment – Solution Annealing
To unlock the full potential of this alloy, solution treatment is mandatory after forming. The process involves heating the Thread Rod to 1100–1150°C (optimal 1120°C), holding for 1 hour per 25 mm of section thickness, followed by rapid water quenching. This dissolves precipitated carbides (such as Cr₂₃C₆) into the austenitic matrix, eliminates residual working stresses, and refines the grain structure. Post-treatment microstructural examination shows a homogeneous solid solution with clearly defined grain boundaries, free from intergranular precipitates.
To unlock the full potential of this alloy, solution treatment is mandatory after forming. The process involves heating the Thread Rod to 1100–1150°C (optimal 1120°C), holding for 1 hour per 25 mm of section thickness, followed by rapid water quenching. This dissolves precipitated carbides (such as Cr₂₃C₆) into the austenitic matrix, eliminates residual working stresses, and refines the grain structure. Post-treatment microstructural examination shows a homogeneous solid solution with clearly defined grain boundaries, free from intergranular precipitates.
Property Enhancements After Solution Annealing
Compared to the as-rolled condition, the solution-annealed Thread Rod exhibits marked improvements:
- Tensile strength rises from 650 MPa to 750–800 MPa; yield strength increases from 300 MPa to 350–400 MPa.
- Ductility (elongation) improves from 30% to 40–45%, while hardness climbs moderately from 150 HV to 180–200 HV.
- High-temperature oxidation rate drops by 30–40% at 1000°C, and creep resistance gains 20–25% under sustained load.
- Corrosion resistance in acidic media improves by 20–30%, extending service life in aggressive flue-gas and chemical environments.
Compared to the as-rolled condition, the solution-annealed Thread Rod exhibits marked improvements:
- Tensile strength rises from 650 MPa to 750–800 MPa; yield strength increases from 300 MPa to 350–400 MPa.
- Ductility (elongation) improves from 30% to 40–45%, while hardness climbs moderately from 150 HV to 180–200 HV.
- High-temperature oxidation rate drops by 30–40% at 1000°C, and creep resistance gains 20–25% under sustained load.
- Corrosion resistance in acidic media improves by 20–30%, extending service life in aggressive flue-gas and chemical environments.
These gains are directly attributable to the complete dissolution of secondary phases and the homogenization of elemental distribution—results that a competent Chinese Manufacturer can consistently replicate through precise furnace control (±5°C) and circulating water-quench systems.
Practical Considerations for Procurement
When sourcing this Thread Rod, engineers should specify solution-annealed condition in their purchase orders, as many stockists supply only mill-annealed or stress-relieved material. The 650 N/mm² baseline refers to the non-treated state; the upgraded 750–800 MPa range is what you actually receive after proper solution treatment. For thermal treatment plants, this post-treatment performance is non-negotiable, as it directly affects bolted-joint relaxation and thread galling resistance at operating temperatures above 900°C. Customization—including non-standard lengths, special threading tolerances, or alternative surface finishes—is readily available, and the MOQ of 10 kg makes trial batches economical for qualification testing.
When sourcing this Thread Rod, engineers should specify solution-annealed condition in their purchase orders, as many stockists supply only mill-annealed or stress-relieved material. The 650 N/mm² baseline refers to the non-treated state; the upgraded 750–800 MPa range is what you actually receive after proper solution treatment. For thermal treatment plants, this post-treatment performance is non-negotiable, as it directly affects bolted-joint relaxation and thread galling resistance at operating temperatures above 900°C. Customization—including non-standard lengths, special threading tolerances, or alternative surface finishes—is readily available, and the MOQ of 10 kg makes trial batches economical for qualification testing.
FAQ
Q1: What is the difference between as-rolled and solution-annealed DIN W.Nr.2.4851 thread rod?
As-rolled material contains undissolved carbides and internal stresses, offering lower ductility and oxidation resistance. Solution annealing (1120°C + water quench) dissolves these carbides, refines the grain, and boosts tensile strength from 650 MPa to 750–800 MPa while improving elongation from 30% to over 40%.
Q1: What is the difference between as-rolled and solution-annealed DIN W.Nr.2.4851 thread rod?
As-rolled material contains undissolved carbides and internal stresses, offering lower ductility and oxidation resistance. Solution annealing (1120°C + water quench) dissolves these carbides, refines the grain, and boosts tensile strength from 650 MPa to 750–800 MPa while improving elongation from 30% to over 40%.
Q2: Can this thread rod be used continuously at 1000°C without significant oxidation?
Yes. After proper solution treatment, the oxidation rate decreases by 30–40% at 1000°C, and creep resistance improves by 20–25%. It is widely used in heat-treatment furnace tube supports and gas turbine bolting where long-term exposure exceeds 900°C.
Yes. After proper solution treatment, the oxidation rate decreases by 30–40% at 1000°C, and creep resistance improves by 20–25%. It is widely used in heat-treatment furnace tube supports and gas turbine bolting where long-term exposure exceeds 900°C.
Q3: Does a Chinese manufacturer offer customization beyond standard ANSI/DIN/NF sizes?
Absolutely. Most reputable suppliers provide custom diameters, non-standard lengths (outside 30–800 mm), special thread pitches, and surface coatings. The typical MOQ is 10 kg, and lead times range from 7 to 30 days depending on batch size and complexity.
Absolutely. Most reputable suppliers provide custom diameters, non-standard lengths (outside 30–800 mm), special thread pitches, and surface coatings. The typical MOQ is 10 kg, and lead times range from 7 to 30 days depending on batch size and complexity.
Q4: Why is water quenching specified instead of air cooling for this alloy?
Water quenching provides the critical cooling rate needed to suppress carbide reprecipitation during cooling. Air cooling is too slow and allows secondary phases to form at grain boundaries, which reduces both corrosion resistance and high-temperature strength. Quenching ensures a fully metastable supersaturated solid solution for optimal performance.
Water quenching provides the critical cooling rate needed to suppress carbide reprecipitation during cooling. Air cooling is too slow and allows secondary phases to form at grain boundaries, which reduces both corrosion resistance and high-temperature strength. Quenching ensures a fully metastable supersaturated solid solution for optimal performance.
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