API 5L Line Pipe

Oil & Gas Pipeline – Seamless – PSL 1 & PSL 2

API Monogram Licensed

Product Overview

API 5L seamless line pipe for oil and gas pipeline transportation. API Monogram licensed. Full traceability.

Grades: A, B, X42, X52, X60, X65, X70, X80
PSL: 1 (standard) or 2 (sour service / critical)
Size: 1/2″ – 24″ | Schedules 10-160

✅ API 5L 46th Edition / ISO 3183
✅ Seamless – pressure integrity
✅ PSL 2 – impact tested, 100% NDT
✅ Sour service – PSL 2 with hardness control
✅ 100% hydrostatic tested
✅ EN 10204 3.1 MTC with heat number

Grade Selection Guide

Most Popular Sizes

PSL 1 vs PSL 2

Applications

Gathering lines | Flow lines | Transmission pipelines | Sour gas lines | Offshore

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API 5DP Drill Pipe Oil & Gas Drilling
– Seamless Steel Tube Supplier
– API Monogram Licensed Grades E75, X95, G105, S135

Product Overview

API 5DP seamless drill pipe for oil and gas drilling. API Monogram licensed. Full traceability.

Grades: E75, X95, G105 (most popular) , S135, SS (sour service)
PSL: 1, 2, 3
OD: 2-3/8″ – 6-5/8″
Connections: NC38, NC50, 5-1/2FH

✅ API 5DP 2nd Edition / ISO 11961
✅ Seamless – maximum torsional strength
✅ Upset ends: EU, IU, IEU
✅ Friction welded tool joints
✅ 100% NDT tested (UT + EMI + hardness)
✅ EN 10204 3.1 MTC with heat number

Grade Selection Guide

Most Popular Sizes

PSL Levels

Optional Features

Hardbanding (Arnco 100XT/200XT/300XT) | Internal coating | Sour service (Grade SS)

Applications

Shallow wells | Deep wells | Ultra-deep wells | Sour gas wells | Offshore drilling

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DIN 2391 Seamless Precision Steel Tube Supplier

Cold Drawn / Cold Rolled – ST35, ST45, ST52

OD 6~204mm | WT 1~18mm | BK, BKW, NBK Delivery Conditions

Product Overview

Our DIN 2391 seamless precision steel tubes are manufactured by cold drawing or cold rolling processes for hydraulic cylinders, pneumatic systems, and precision mechanical applications. These tubes offer high dimensional accuracy, excellent surface finish, and consistent mechanical properties.

DIN 2391 Seamless Precision Steel Tube Supplier

Cold Drawn / Cold Rolled – ST35, ST45, ST52

OD 6~204mm | WT 1~18mm | BK, BKW, NBK Delivery Conditions

Product Overview

Our DIN 2391 seamless precision steel tubes are manufactured by cold drawing or cold rolling processes for hydraulic cylinders, pneumatic systems, and precision mechanical applications. These tubes offer high dimensional accuracy, excellent surface finish, and consistent mechanical properties.

DIN 1629 Seamless Non-Alloy Steel Tube

Special Requirements – Grades St37.0, St44.0, St52.0

Product Overview

DIN 1629 seamless steel tubes for pressure purposes and special requirements. Supplied for legacy replacement, maintenance, and retrofit projects.

Grades: St37.0 (P235TR2), St44.0 (P265TR2), St52.0 (P355N – high strength)
Size: 10mm – 610mm OD | WT: 1.5mm – 50mm

✅ DIN 1629-1984 (withdrawn – supplied for legacy projects)
✅ Seamless – hydrostatic tested
✅ St37.0 = P235TR2 | St52.0 = P355N
✅ 100% hydrostatic tested per standard
✅ EN 10204 3.1 MTC with heat number

Grade Selection

Contact

DIN 17175 Seamless Heat-Resistant Steel Tube

For Boiler, Superheater, and High Temperature Service

Grades St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910

German Standard – Withdrawn, Replaced by EN 10216-2 – Supplied for Legacy Projects

Product Overview

DIN 17175 is the German standard for seamless heat-resistant steel tubes intended for boilers, superheaters, heat exchangers, and high temperature pressure systems. These tubes offer excellent creep strength and oxidation resistance for elevated temperature service up to 600°C .

Key Characteristics:

Heat-Resistant Definition:
Steels that maintain good mechanical properties under long-term stress at high temperatures up to 600°C .

Steel Grades Covered:

• St35.8 – Carbon steel for general boiler service (EN 10216-2: P235GH)

• St45.8 – Carbon steel for higher strength boiler service (EN 10216-2: P265GH)

• 15Mo3 – Molybdenum alloy steel for medium temperature service (EN 10216-2: 16Mo3)

• 13CrMo44 – 1% Chrome-0.5% Molybdenum for high temperature service (EN 10216-2: 13CrMo4-5)

• 10CrMo910 – 2.25% Chrome-1% Molybdenum for advanced high temperature (EN 10216-2: 10CrMo9-10)

⚠️ Important Note: DIN 17175 has been withdrawn and replaced by EN 10216-2 . However, we continue to supply material to DIN 17175 specifications for legacy replacement, maintenance, and retrofit projects where the old standard is still specified .

✅ DIN 17175 compliant – Supplied to withdrawn standard for legacy projects
✅ Seamless construction – Safe for high pressure/temperature
✅ Heat-resistant grades – Good mechanical properties at high temperatures
✅ Full range of grades – St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910
✅ Proper heat treatment – Normalized, subcritical annealed, or quenched and tempered
✅ 100% NDT tested – Ultrasonic or eddy current
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Fast delivery

Key Specifications

📌 Heat treatment: Tubes shall be appropriately heat treated over their entire length. Depending on steel type, treatments include normalizing, subcritical annealing, quenching and tempering, or isothermal transformation hardening and tempering .

Steel Grade Cross-Reference

💡 For new projects, we recommend specifying EN 10216-2 equivalents .

Grade Selection Guide – Temperature & Application

Chemical Composition – DIN 17175 Grades

Mechanical Properties – DIN 17175 Grades

Elevated Temperature Capability

⚠️ 15Mo3 Limitation: This steel tends toward graphitization during long-term operation at high temperatures. Therefore, its operating temperature should be controlled below 510°C .

Available Sizes – DIN 17175 Tubes

💡 Most popular sizes: 114.3mm, 168.3mm, 219.1mm OD – 13CrMo44 .

Applications – DIN 17175 Tubes

Quality Assurance & Testing

Mill Test Certificate

• DIN 17175 Certificate of Compliance – Supplied to original standard

• EN 10204 Type 3.1 MTC – Provided with heat number

• EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV)

• Heat treatment records – Normalizing temperatures and methods

• Mechanical test reports – Tensile, flattening results

• NDT reports – 100% UT results

• Traceability: Full traceability from melt to finished tube

Why Choose Our DIN 17175 Tubes?

Contact for Quote

Please provide the following details:

• Grade : St35.8 / St45.8 / 15Mo3 / 13CrMo44 / 10CrMo910

• OD (mm) : _______

• WT (mm) : _______

• Length (m) : _______

• Quantity : _______ (pieces / meters / tons)

• Application : Boiler / Superheater / Replacement / Other _______

• Service Temperature : _______ °C

• End Finish : Plain / Beveled

• Inspection : Standard / Third-party (SGS/BV/TUV)

EN 10305 Seamless Cold Drawn Precision Steel Tube

Hydraulic & Pneumatic Systems – Grades E235, E355, 42CrMo4

Product Overview

EN 10305 seamless cold drawn precision steel tubes for hydraulic cylinders, pneumatic systems, and precision mechanical applications.

Standards: EN 10305-1 (general), EN 10305-4 (hydraulic/pneumatic)
Grades: E235, E355 (most common) , 42CrMo4, 34CrMo4
OD: 4mm – 120mm | WT: 0.5mm – 20mm

✅ Cold drawn seamless – precision dimensions
✅ Metric sizes – 25-120mm OD standard
✅ Delivery conditions: BK, BKW, NBK, +QT
✅ Tight tolerances – ISO H8, H9, H10
✅ Honing / skiving available for hydraulic cylinders
✅ EN 10204 3.1 MTC with heat number

Grade Selection – Hydraulic Cylinders

Most Popular Sizes – Hydraulic Cylinder Tubes

Contact

EN 10305 Seamless Cold Drawn Precision Steel Tube Supplier

For Hydraulic & Pneumatic Systems – E235, E355

OD 6~204mm | WT 1~18mm | Cold Drawn

Product Overview

Our EN 10305 seamless cold drawn precision steel tubes are specifically designed for hydraulic and pneumatic systems, precision machinery, and automotive applications. Manufactured by the cold drawing process at our Wuxi facility, these tubes offer tight dimensional tolerances, excellent surface finish, and consistent mechanical properties.

Applicable Standards:

• EN 10305-1 – General precision tubes

• EN 10305-4 – Hydraulic/pneumatic power systems (with pressure testing)

Key Specifications:

• Standard: EN 10305-1 / EN 10305-4

• Grades: E235 (St37.4), E355 (St52.4 – most popular)

• Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)

• Wall Thickness: 1mm – 18mm

• Length: 3m – 12m (Custom lengths available)

• Manufacturing Process: Cold Drawn (Seamless)

• Delivery Conditions: BK, BKW, NBK, GBK, +C, +SR, +N, +QT

• Surface Finish: As-drawn / Bright / Oiled / Phosphated

✅ EN 10305 certified – Current European standard for precision tubes
✅ Cold drawn seamless – Tight tolerances, excellent surface finish
✅ E355 grade – ≥355 MPa yield – most popular for hydraulic cylinders
✅ Multiple delivery conditions – BK, BKW, NBK – match to application
✅ 100% NDT and pressure testing available – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery

Steel Grade Overview

💡 E355 is the most popular grade for hydraulic cylinder applications – excellent balance of strength, ductility, and weldability.

Delivery Conditions – EN 10305

💡 NBK (normalized) is the most popular delivery condition for hydraulic cylinders – good strength with excellent ductility and weldability. BKW is recommended for chrome plated piston rods.

Chemical Composition

💡 Low carbon content ensures excellent weldability and formability for precision applications.

Mechanical Properties – E355 (Most Popular)

EN 10216-1 Seamless Non-Alloy Steel Tube

Pressure Purposes – Grades P195, P235, P265 – TR1 & TR2 Quality

Product Overview

EN 10216-1 seamless non-alloy steel tubes for pressure purposes – boilers, pressure vessels, and industrial piping. PED harmonized standard – CE marking available.

Grades: P195, P235 (most common) , P265
Quality: TR1 (standard), TR2 (enhanced)
Size: 10mm – 610mm OD | WT: 1.5mm – 50mm

✅ EN 10216-1:2013 – PED 2014/68/EU harmonized
✅ Seamless – pressure integrity
✅ TR1 and TR2 quality levels available
✅ 100% NDT + hydrostatic tested
✅ EN 10204 3.1 MTC with heat number

Grade Selection

TR1 vs TR2 Quality

Most Popular Sizes – P235

Contact

EN 10297-1 Seamless Steel Tube

Mechanical and General Engineering – Grades E235, E355, 42CrMo4

Product Overview

EN 10297-1 seamless steel tubes for mechanical and general engineering purposes – hydraulic cylinders, shafts, machined parts, and structural components.

Most Popular Grades: E235 (+N), E355 (+N) , 42CrMo4 (+QT)
Case Hardening Grades: 16MnCr5, 20MnCr5 (+U)
Size: 10mm – 610mm OD | WT: 1.5mm – 50mm

✅ EN 10297-1:2003 – current European standard
✅ Seamless – for mechanical integrity
✅ E355 – most popular for general engineering
✅ 42CrMo4 – high strength quenched & tempered alloy
✅ Case hardening grades per Annex A
✅ EN 10204 3.1 MTC with heat number

Grade Selection – Mechanical Applications

Common Stock Sizes – Hydraulic Cylinder Tubes

Contact

EN 10216-2 P235GH Seamless Steel Tube Supplier

Pressure Purposes – Elevated Temperature Service – TC1 & TC2 Quality

OD 6~204mm | WT 1~18mm | Cold Drawn

Product Overview

Our EN 10216-2 P235GH seamless non-alloy steel tubes are specifically designed for pressure purposes at elevated temperatures. Manufactured by the cold drawing process at our Wuxi facility, these tubes are suitable for boilers, superheaters, heat exchangers, and pressure piping systems operating at temperatures up to 400°C.

Quality Levels:

• TC1 – Standard quality level for general pressure applications

• TC2 – Higher quality level with Charpy impact testing (27J min at 0°C)

Key Specifications:

• Standard: EN 10216-2:2023

• Material: Non-alloy carbon steel (P235GH)

• Material Number: 1.0345

• Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)

• Wall Thickness: 1mm – 18mm

• Length: 4m – 12m (Custom lengths available)

• Manufacturing Process: Cold Drawn (Seamless)

• Heat Treatment: Normalized (≥845°C)

• Surface Finish: Black / Bare / Oiled

✅ EN 10216-2 certified – Compliant with PED 2014/68/EU – CE marking available
✅ Seamless cold drawn – No weld seam – pressure integrity assured
✅ Elevated temperature design – Creep strength data available up to 400°C
✅ TC2 quality – Charpy impact tested at 0°C (27J min)
✅ 100% NDT and hydrostatic tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery

Chemical Composition – P235GH

💡 Low phosphorus and sulfur ensures excellent toughness and weldability for pressure equipment service. Aluminum (≥0.020%) provides grain refinement for improved properties.

Mechanical Properties

TC1 vs TC2 – Quality Levels

💡 Choose TC2 when impact toughness is required – typically specified for low temperature start-up conditions or critical pressure equipment.

Manufacturing Process – Cold Drawing

Cold Drawing Process for Pressure Tubes:

1. Hot rolled tubes are pickled to remove scale

2. Cold drawing precisely reduces the diameter – increases strength

3. Annealing (normalizing) – ensures fine grain structure, restores ductility

4. Straightening – ensures straightness for installation

5. Precision cutting – to exact customer length

6. 100% NDT and hydrostatic testing – guarantees integrity

7. Charpy impact testing (TC2) – verifies low temperature toughness

Elevated Temperature Yield Strength (Rp0.2 MPa min)

💡 P235GH maintains good strength up to 400°C – above this temperature, use 16Mo3 or 13CrMo4-5 alloy grades.

Key Applications

💡 TC2 is recommended for critical applications requiring impact toughness at low temperature start-up conditions.

DIN 17175 Cross-Reference

💡 P235GH is the direct replacement for St35.8 – for legacy projects, we supply both standards.

Why Choose Our EN 10216-2 P235GH Tubes?

Contact for Quote

EN 10216-1 Seamless Non-Alloy Steel Tube

Pressure Purposes – Grades P195, P235, P265 – TR1 & TR2 Quality

Product Overview

EN 10216-1 seamless non-alloy steel tubes for pressure purposes – boilers, pressure vessels, and industrial piping. PED harmonized standard – CE marking available.

Grades: P195, P235 (most common) , P265
Quality: TR1 (standard), TR2 (enhanced)
Size: 10mm – 610mm OD | WT: 1.5mm – 50mm

✅ EN 10216-1:2013 – PED 2014/68/EU harmonized
✅ Seamless – pressure integrity
✅ TR1 and TR2 quality levels available
✅ 100% NDT + hydrostatic tested
✅ EN 10204 3.1 MTC with heat number

Grade Selection

TR1 vs TR2 Quality

Most Popular Sizes – P235

Contact

EN 10216-2 P235GH Seamless Steel Tube Supplier

Pressure Purposes – Elevated Temperature Service – TC1 & TC2 Quality

OD 6~204mm | WT 1~18mm | Cold Drawn

Product Overview

Our EN 10216-2 P235GH seamless non-alloy steel tubes are specifically designed for pressure purposes at elevated temperatures. Manufactured by the cold drawing process at our Wuxi facility, these tubes are suitable for boilers, superheaters, heat exchangers, and pressure piping systems operating at temperatures up to 400°C.

Quality Levels:

• TC1 – Standard quality level for general pressure applications

• TC2 – Higher quality level with Charpy impact testing (27J min at 0°C)

Key Specifications:

• Standard: EN 10216-2:2023

• Material: Non-alloy carbon steel (P235GH)

• Material Number: 1.0345

• Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)

• Wall Thickness: 1mm – 18mm

• Length: 4m – 12m (Custom lengths available)

• Manufacturing Process: Cold Drawn (Seamless)

• Heat Treatment: Normalized (≥845°C)

• Surface Finish: Black / Bare / Oiled

✅ EN 10216-2 certified – Compliant with PED 2014/68/EU – CE marking available
✅ Seamless cold drawn – No weld seam – pressure integrity assured
✅ Elevated temperature design – Creep strength data available up to 400°C
✅ TC2 quality – Charpy impact tested at 0°C (27J min)
✅ 100% NDT and hydrostatic tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery

Chemical Composition – P235GH

💡 Low phosphorus and sulfur ensures excellent toughness and weldability for pressure equipment service. Aluminum (≥0.020%) provides grain refinement for improved properties.

Mechanical Properties

TC1 vs TC2 – Quality Levels

💡 Choose TC2 when impact toughness is required – typically specified for low temperature start-up conditions or critical pressure equipment.

Manufacturing Process – Cold Drawing

Cold Drawing Process for Pressure Tubes:

1. Hot rolled tubes are pickled to remove scale

2. Cold drawing precisely reduces the diameter – increases strength

3. Annealing (normalizing) – ensures fine grain structure, restores ductility

4. Straightening – ensures straightness for installation

5. Precision cutting – to exact customer length

6. 100% NDT and hydrostatic testing – guarantees integrity

7. Charpy impact testing (TC2) – verifies low temperature toughness

Elevated Temperature Yield Strength (Rp0.2 MPa min)

💡 P235GH maintains good strength up to 400°C – above this temperature, use 16Mo3 or 13CrMo4-5 alloy grades.

Key Applications

💡 TC2 is recommended for critical applications requiring impact toughness at low temperature start-up conditions.

DIN 17175 Cross-Reference

💡 P235GH is the direct replacement for St35.8 – for legacy projects, we supply both standards.

Why Choose Our EN 10216-2 P235GH Tubes?

Contact for Quote

ASTM A334 Grade 6 & Grade 1 Seamless Low Temperature Tube Supplier

For Cryogenic & Low Temperature Service – OD 6~204mm | WT 1~18mm

Product Overview

Our ASTM A334 / ASME SA334 seamless low temperature tubes are manufactured in both Grade 6 and Grade 1 for service down to -45°C (-50°F). These tubes are designed for heat exchangers, condensers, and small-bore piping in cold climate, refrigeration, and petrochemical applications.

Key Specifications:

• Standard: ASTM A334 / ASME SA334

• Wall Type: Minimum wall thickness (no negative deviation)

• Grades: Grade 6 (Most popular – carbon steel, higher strength), Grade 1 (Standard carbon steel)

• Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)

• Wall Thickness: 1mm – 18mm

• Length: 3m – 12m (Custom lengths available)

• Manufacturing Process: Cold Drawn (Seamless)

• Tested: Charpy impact tested at -45°C

✅ ASME SA334 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Seamless cold drawn – No weld seam – eliminates brittle fracture risk at low temperature
✅ Charpy impact tested – Guaranteed toughness at -45°C – certified report provided
✅ Minimum wall thickness – No negative deviation – consistent tube integrity
✅ Grade 6 most economical – Best value for -45°C service
✅ 100% hydrostatic & NDT tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC + Impact Report provided
✅ Factory direct – Competitive pricing and fast delivery

Grade Selection – Low Temperature Service

💡 Grade 6 is preferred for most applications – it offers higher strength (≥415 MPa tensile) compared to Grade 1 (≥380 MPa) at the same service temperature.

Chemical Composition

📌 Note for Grade 1: Each reduction of 0.01% carbon below 0.30% permits an increase of manganese of 0.05% above 1.06%, up to a maximum of 1.35%.

Mechanical Properties

Low Temperature Charpy Impact Requirements

💡 Charpy impact testing is mandatory for both Grade 1 and Grade 6 at -45°C – certified report provided with every shipment.

Manufacturing Process – Cold Drawing with Low Temperature Toughness

Cold Drawing Process for Low Temperature Service:

1. Hot rolled tubes are pickled to remove scale

2. Cold drawing precisely reduces the diameter

3. Heat treatment (normalizing or stress relieving) – ensures fine grain structure for low temperature toughness

4. Straightening – ensures dimensional consistency

5. Precision cutting – to exact length

6. 100% NDT and hydrostatic testing – guarantees integrity

7. Charpy impact testing at -45°C – verifies low temperature toughness

Grade Comparison – Grade 1 vs Grade 6

💡 Grade 6 offers 17% higher tensile strength than Grade 1 – preferred for most low temperature applications where higher strength is beneficial.

Key Applications – Low Temperature Service

💡 Grade 6 is the preferred choice for most low temperature heat exchanger applications due to its higher strength and widespread availability.

Why Choose Our ASTM A334 Low Temperature Tubes?

Contact for Quote

ASTM A192 Cold Drawn Seamless Carbon Steel Boiler Tube Supplier

High Pressure Service – OD 6~204mm | WT 1~18mm

Product Overview

Our ASTM A192 / ASME SA192 cold drawn seamless carbon steel boiler tubes are specifically designed for high pressure boiler service in power plants and industrial boilers. Manufactured by the cold drawing process at our Wuxi facility, these tubes offer higher strength than SA179 and are ideal for water wall tubes, economizers, and low temperature superheaters.

Key Specifications:

• Standard: ASTM A192 / ASME SA192

• Material: Carbon Steel (0.06-0.18% C)

• Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)

• Wall Thickness: 1mm – 18mm

• Length: 3m – 12m (Custom lengths available)

• Manufacturing Process: Cold Drawn (Seamless)

• Hardness: ≤77 HRB – slightly harder than SA179 for higher pressure service

✅ ASTM A192 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Seamless cold drawn – No weld seam – zero leak risk at high pressure
✅ Higher strength than SA179 – Designed for high pressure boiler service
✅ Up to 850°F (454°C) – Elevated temperature capability
✅ 100% hydrostatic & eddy current tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery

Chemical Composition

💡 Controlled carbon and manganese content ensures consistent mechanical properties and excellent weldability for boiler fabrication.

Mechanical Properties

Dimensional Tolerances – Cold Drawn

Manufacturing Process – Cold Drawing

Cold Drawing Process for Boiler Tubes:

1. Hot rolled tubes are pickled to remove scale

2. Cold drawing precisely reduces the diameter – increases strength

3. Annealing (normalizing) – restores ductility, ensures uniform microstructure

4. Straightening – ensures straightness for boiler installation

5. Precision cutting – to exact customer length requirements

6. 100% NDT and hydrostatic testing – guarantees integrity

ASME SA192 vs ASME SA179

💡 SA192 is designed for high pressure boiler service with heavier wall capability and larger diameters.

Key Applications