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UNS N08031/DIN W. NR. 1.4562 Seamless Pipe is a high-performance iron-chromium-molybdenum-nitrogen alloy tube designed for extreme corrosion resistance. This premium seamless pipe is tailored for industrial environments where exposure to aggressive media (phosphoric acid, sulfuric acid, chlorides) is common, outperforming conventional stainless steels in durability and longevity.
Compliant with ASTM B 622 and B 829 standards, the pipe features precise dimensional control: OD ranges from 1mm to 325mm, wall thickness from 0.2mm to 20mm, and maximum length up to 12m (custom lengths available). Its physical properties include a density of 8.07g/cm³ and a melting range of 1330-1397℃, balancing thermal stability and mechanical strength. The chemical composition is optimized for performance: Fe (balance), Ni 30.00-32.00%, Cr 26.00-28.00%, Cu 1.00-1.40%, Mo 6.00-7.00%, Mn ≤2.00%, Si ≤0.30%, C ≤0.02%, N 0.15-0.25%, P ≤0.02%, and S ≤0.01%—delivering exceptional corrosion resistance and structural integrity.
The alloy’s unique composition (high Cr, Mo, and N content) provides superior resistance to uniform corrosion, pitting, and crevice corrosion in phosphoric acid, sulfuric acid, and chloride-rich environments. This makes it ideal for chemical processing and marine applications where standard materials fail prematurely.
Backed by 30 years of manufacturing experience, the facility operates 18 seamless production lines and 3 perforation production lines, with an annual capacity of 30,000 tons of austenitic and duplex steel pipes. The team comprises 296 employees, including 4 senior engineers, 18 engineers, and 38 professional technicians—ensuring technical precision throughout production.
The factory holds ISO9001:2015 certification and approvals from leading classification societies (BV, ABS, CCS, DNV/GL, TUV, LR, KR). Raw materials undergo MTC (PMI) checks, tensile strength tests, and surface/dimension inspections. Pre-shipment quality control includes appearance testing, PMI testing, non-destructive testing (UT, ET), and physical/chemical analyses—with support for third-party inspections.
Alloy 31 is a Alloy-iron-chromium-molybdenum alloy with nitrogen addition.
It has excellent resistance to corrosion of phosphoric acid, sulfuric acid, chloride, etc.
APPLICATIONS
Chemical and petrochemical industry, pulp and paper industry, flue gas desulfurization system components, seawater or brine solution heat exchanger.
This seamless pipe is widely used in the chemical and petrochemical industry (processing equipment, piping systems), pulp and paper industry (bleaching equipment), flue gas desulfurization systems (corrosion-resistant components), and seawater/brine heat exchangers (withstanding high-salinity environments). Its versatility also extends to offshore oil and gas, power generation, and water treatment sectors.
In chemical plants, it resists aggressive acids and solvents, reducing maintenance downtime. In flue gas desulfurization systems, it withstands sulfur dioxide and acidic condensates. For seawater heat exchangers, its chloride resistance prevents pitting and crevice corrosion, extending service life.
Our pipe factory has 296 employees ,including 4 senior engineers,18 engineers and 38 professional technicians.
We can produces 30,000tons of austenitic steel and duplex steel pipes annually with 18 seamless production lines and 3 perforation production lines.
Our pipe factory has been certified to the ISO9001:2015 quality management system and certified by various classification societies (such as BV, ABS,CCS,DNV/GL,TUV,LR,KR etc).
Chemical Composition | |||||||
% | Ni | Fe | C | Mn | Si | S | Cu |
MIN | 99.00 | ||||||
MAX | 0.40 | 0.02 | 0.35 | 0.35 | 0.01 | 0.25 | |
Specification | Physical Properties | ||||
Seamless pipe and tube | ASTM B 161, B 829 | DENSITY | 8.89g/cm3 | MELTING RANGE | 1435-1446℃ |
Specifications Of UNS N02201/DIN W. NR. 2.4061, 2.4068 Seamless Pipe |
OD: 1mm-325mm
WALL THICKNESS: 0.2mm-20mm
Max Length:12m (Special specifications are available as required)
Production Processes |
Quality Control Of Huashang Duplex Steel Seamless Pipe |
1. Raw Materials
Our raw materials come from well-know mills in China, such as Tingshan, Tisco, Bao Steel, Yongxing, Walsn.....
We will do MTC checking (PMI), tensile strength test, surface/dimension inspection for raw material.
2. Production
Specially assigned person shall follow up and check the process flow card and finally keep the copy.
3. Before Shipment
Our quality inspection team responsible for different categories of products. We will conduct routine appearance testing, PMI testing, non-destructive testing. We also equipped with a professional lab that can do physical and chemical properties test. we also can accept the third inspection, such as BV, LR, TUV, ABS, DNV-GL ect.
METALLOGRAPHIC TEST
IMPACT TEST
TENSILE TEST
EDDY CURRENT TESTING
ULTRASONIC TESTING
HARDNESS TEST
TEST BLOCK MEASUREMENT SIZE
MEASURE AFTER PULLING
PULL UP TEST BLOCK
Packaging and Containerization |
Certificate |
Quality management system certificate
Occupational health and safety management system certification
Environmental management system certificate
CCS certificate
TUV-PED certificate
It exhibits excellent resistance to phosphoric acid, sulfuric acid, chlorides, seawater, brine, and flue gas desulfurization byproducts. It is also resistant to most organic acids and alkaline solutions, making it suitable for diverse industrial applications.
Delivery time ranges from 15 to 100 days depending on order quantity and custom specifications. In-stock items (standard dimensions) can be shipped within shorter timeframes—contact the sales team for exact timelines.
Yes, the factory accepts third-party inspections from authorized bodies such as BV, LR, TUV, ABS, and DNV-GL. All inspection processes are documented to ensure compliance with customer requirements and international standards.
UNS N08031/DIN W. NR. 1.4562 Seamless Pipe is a high-performance iron-chromium-molybdenum-nitrogen alloy tube designed for extreme corrosion resistance. This premium seamless pipe is tailored for industrial environments where exposure to aggressive media (phosphoric acid, sulfuric acid, chlorides) is common, outperforming conventional stainless steels in durability and longevity.
Compliant with ASTM B 622 and B 829 standards, the pipe features precise dimensional control: OD ranges from 1mm to 325mm, wall thickness from 0.2mm to 20mm, and maximum length up to 12m (custom lengths available). Its physical properties include a density of 8.07g/cm³ and a melting range of 1330-1397℃, balancing thermal stability and mechanical strength. The chemical composition is optimized for performance: Fe (balance), Ni 30.00-32.00%, Cr 26.00-28.00%, Cu 1.00-1.40%, Mo 6.00-7.00%, Mn ≤2.00%, Si ≤0.30%, C ≤0.02%, N 0.15-0.25%, P ≤0.02%, and S ≤0.01%—delivering exceptional corrosion resistance and structural integrity.
The alloy’s unique composition (high Cr, Mo, and N content) provides superior resistance to uniform corrosion, pitting, and crevice corrosion in phosphoric acid, sulfuric acid, and chloride-rich environments. This makes it ideal for chemical processing and marine applications where standard materials fail prematurely.
Backed by 30 years of manufacturing experience, the facility operates 18 seamless production lines and 3 perforation production lines, with an annual capacity of 30,000 tons of austenitic and duplex steel pipes. The team comprises 296 employees, including 4 senior engineers, 18 engineers, and 38 professional technicians—ensuring technical precision throughout production.
The factory holds ISO9001:2015 certification and approvals from leading classification societies (BV, ABS, CCS, DNV/GL, TUV, LR, KR). Raw materials undergo MTC (PMI) checks, tensile strength tests, and surface/dimension inspections. Pre-shipment quality control includes appearance testing, PMI testing, non-destructive testing (UT, ET), and physical/chemical analyses—with support for third-party inspections.
Alloy 31 is a Alloy-iron-chromium-molybdenum alloy with nitrogen addition.
It has excellent resistance to corrosion of phosphoric acid, sulfuric acid, chloride, etc.
APPLICATIONS
Chemical and petrochemical industry, pulp and paper industry, flue gas desulfurization system components, seawater or brine solution heat exchanger.
This seamless pipe is widely used in the chemical and petrochemical industry (processing equipment, piping systems), pulp and paper industry (bleaching equipment), flue gas desulfurization systems (corrosion-resistant components), and seawater/brine heat exchangers (withstanding high-salinity environments). Its versatility also extends to offshore oil and gas, power generation, and water treatment sectors.
In chemical plants, it resists aggressive acids and solvents, reducing maintenance downtime. In flue gas desulfurization systems, it withstands sulfur dioxide and acidic condensates. For seawater heat exchangers, its chloride resistance prevents pitting and crevice corrosion, extending service life.
Our pipe factory has 296 employees ,including 4 senior engineers,18 engineers and 38 professional technicians.
We can produces 30,000tons of austenitic steel and duplex steel pipes annually with 18 seamless production lines and 3 perforation production lines.
Our pipe factory has been certified to the ISO9001:2015 quality management system and certified by various classification societies (such as BV, ABS,CCS,DNV/GL,TUV,LR,KR etc).
Chemical Composition | |||||||
% | Ni | Fe | C | Mn | Si | S | Cu |
MIN | 99.00 | ||||||
MAX | 0.40 | 0.02 | 0.35 | 0.35 | 0.01 | 0.25 | |
Specification | Physical Properties | ||||
Seamless pipe and tube | ASTM B 161, B 829 | DENSITY | 8.89g/cm3 | MELTING RANGE | 1435-1446℃ |
Specifications Of UNS N02201/DIN W. NR. 2.4061, 2.4068 Seamless Pipe |
OD: 1mm-325mm
WALL THICKNESS: 0.2mm-20mm
Max Length:12m (Special specifications are available as required)
Production Processes |
Quality Control Of Huashang Duplex Steel Seamless Pipe |
1. Raw Materials
Our raw materials come from well-know mills in China, such as Tingshan, Tisco, Bao Steel, Yongxing, Walsn.....
We will do MTC checking (PMI), tensile strength test, surface/dimension inspection for raw material.
2. Production
Specially assigned person shall follow up and check the process flow card and finally keep the copy.
3. Before Shipment
Our quality inspection team responsible for different categories of products. We will conduct routine appearance testing, PMI testing, non-destructive testing. We also equipped with a professional lab that can do physical and chemical properties test. we also can accept the third inspection, such as BV, LR, TUV, ABS, DNV-GL ect.
METALLOGRAPHIC TEST
IMPACT TEST
TENSILE TEST
EDDY CURRENT TESTING
ULTRASONIC TESTING
HARDNESS TEST
TEST BLOCK MEASUREMENT SIZE
MEASURE AFTER PULLING
PULL UP TEST BLOCK
Packaging and Containerization |
Certificate |
Quality management system certificate
Occupational health and safety management system certification
Environmental management system certificate
CCS certificate
TUV-PED certificate
It exhibits excellent resistance to phosphoric acid, sulfuric acid, chlorides, seawater, brine, and flue gas desulfurization byproducts. It is also resistant to most organic acids and alkaline solutions, making it suitable for diverse industrial applications.
Delivery time ranges from 15 to 100 days depending on order quantity and custom specifications. In-stock items (standard dimensions) can be shipped within shorter timeframes—contact the sales team for exact timelines.
Yes, the factory accepts third-party inspections from authorized bodies such as BV, LR, TUV, ABS, and DNV-GL. All inspection processes are documented to ensure compliance with customer requirements and international standards.
