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DIN 2391 ST35.4 Seamless Steel Tube For Automotive Parts - Wholesale

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Product Spotlights

Seamless Superheater Tube For High Temperature Boiler Service – ASME SA213 / SA210 Outer Diameter 6mm – 256mm | Wall Thickness 1mm – 18mm
Negotiable MOQ: 1 Metric Ton (Price negotiable depending on order volume and customization)
Key Specifications
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Type:
Seamless
Warranty:
1Y
Technique:
Cold Drawn
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Wuxi Hengzhihui Metal Materials Co., Ltd.
Gold Verified Supplier
1Yr
Verified Business License
Payment & Shipping
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Port of Shipment:
Shanghai
Delivery Detail:
30 days

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  • Product Details

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Type Seamless
Warranty 1Y
Technique Cold Drawn
Surface Treatment Polished
Usage Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose, Other
Material Carbon Steel
After-sales Service Y
Section Shape Round
Specification 204MM
Trademark N/A
Origin China

Seamless Superheater Tube

For High Temperature Boiler Service – ASME SA213 / SA210

Outer Diameter 6mm – 256mm | Wall Thickness 1mm – 18mm

Product Overview

Our seamless superheater tube is specifically designed for high temperature service in power plant boilers, superheaters, reheaters, and high pressure heat exchangers. Manufactured to ASME SA213 (T11, T22, T91) and ASME SA210 Grade C standards, these tubes offer excellent creep strength, oxidation resistance, and thermal fatigue resistance at elevated temperatures.

Available in two material families:

Material Type Standard Grades Max Temp Application
Medium carbon steel ASME SA210 Grade C 900°F (482°C) Low to medium temperature superheater sections
Ferritic alloy (Cr-Mo) ASME SA213 T11, T22, T91 1,200°F (650°C) High temperature superheater, reheater

Key Features:

  • Seamless construction – No weld seam – eliminates creep failure risk

  • Full range of sizes – OD 6mm to 256mm, WT 1mm to 18mm

  • Precision tolerances – Tight OD and WT control for easy field bending and welding

  • Heat treated – Normalized (SA210) or normalized + tempered (SA213)

  • 100% NDT tested – Eddy current + ultrasonic + hydrostatic

✅ ASME SA213 / SA210 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Full traceability – EN 10204 Type 3.1 MTC with heat number
✅ Wide size range – 6mm to 256mm OD – one-stop sourcing
✅ High temperature performance – Creep strength data available for all grades
✅ U-bends available – For pendant superheater designs
✅ Factory direct | Global shipping

Key Specifications

Parameter Details
Outer Diameter (OD) 6mm – 256mm (0.236″ – 10.0″)
Wall Thickness (WT) 1mm – 18mm (0.039″ – 0.709″)
Length 4m – 12m (fixed or random) – up to 18m on request
Manufacturing Seamless – Hot rolled or Cold drawn
Standards ASME SA210 Grade C, ASME SA213 T11/T22/T91, ASTM A213
Surface Finish Black / Bare / Oiled
End Finish Plain / Beveled (for welding)
Heat Treatment Normalized (SA210) / Normalized + Tempered (SA213 T11/T22/T91)

Chemical Composition

ASME SA210 Grade C (Medium Carbon Steel):

Element C Mn P max S max Si
Requirement ≤0.35% 0.29-1.06% 0.035% 0.035% ≥0.10%

ASME SA213 T11 (1.25Cr-0.5Mo):

Element C Mn P max S max Si Cr Mo
Requirement ≤0.15% 0.30-0.60% 0.025% 0.025% 0.50-1.00% 1.00-1.50% 0.44-0.65%

ASME SA213 T22 (2.25Cr-1Mo):

Element C Mn P max S max Si Cr Mo
Requirement ≤0.15% 0.30-0.60% 0.025% 0.025% ≤0.50% 1.90-2.60% 0.87-1.13%

ASME SA213 T91 (9Cr-1Mo-V):

Element C Mn P max S max Si Cr Mo V Nb N
Requirement 0.08-0.12% 0.30-0.60% 0.020% 0.010% 0.20-0.50% 8.00-9.50% 0.85-1.05% 0.18-0.25% 0.06-0.10% 0.030-0.070%

💡 T91 offers superior creep strength – the most popular grade for modern supercritical boilers.

Mechanical Properties at Room Temperature

Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (max)
SA210 Gr.C ≥485 ≥275 ≥30 89 HRB
SA213 T11 ≥415 ≥205 ≥30 85 HRB
SA213 T22 ≥415 ≥205 ≥30 85 HRB
SA213 T91 ≥585 ≥415 ≥20 250 HB

Elevated Temperature Yield Strength – Rp0.2 (MPa min)

Temp (°C) SA210 Gr.C T11 T22 T91
400 — 195 195 385
450 — 170 180 380
500 — 145 155 370
550 — 120 130 360
600 — — — 280

💡 T91 maintains high strength even at 600°C – suitable for ultra-supercritical power plants.

Available Sizes – OD 6mm to 256mm

OD (mm) OD (inch) WT (mm) Typical Grade Application
6 – 16 0.236″ – 0.630″ 1.0 – 2.5 SA210 Gr.C Instrumentation superheater leads
16 – 32 0.630″ – 1.260″ 1.5 – 4.0 SA210 Gr.C, T11 Small bore superheater coils
32 – 60 1.260″ – 2.362″ 2.0 – 6.0 T11, T22 Low temp superheater pendants
60 – 89 2.362″ – 3.504″ 3.0 – 8.0 T22, T91 High temp superheater – most common
89 – 114 3.504″ – 4.488″ 4.0 – 10.0 T91 Final superheater
114 – 168 4.488″ – 6.614″ 5.0 – 12.0 T91 Reheater tubes
168 – 219 6.614″ – 8.622″ 6.0 – 15.0 T91 Large superheater headers
219 – 256 8.622″ – 10.079″ 8.0 – 18.0 T91 Main steam leads

💡 Most popular superheater tube size: 2″ (50.8mm) OD × 4.0-6.0mm WT – Grade T91

Grade Selection Guide – Superheater Service

Superheater Section Steam Temp (°F) Metal Temp (°F) Recommended Grade
Low temperature superheater 700-850°F 750-900°F SA210 Gr.C
Intermediate superheater 850-950°F 900-1,000°F T11, T22
High temperature superheater 950-1,050°F 1,000-1,100°F T91
Final superheater (supercritical) 1,050-1,150°F 1,100-1,200°F T91
Ultra-supercritical final superheater 1,150-1,200°F 1,200-1,250°F T91 (grade limit)

💡 For metal temperatures above 1,200°F, use ASME SA213 TP304H or TP347H austenitic stainless steel.

Key Advantages – Superheater Service

Feature Benefit
Seamless construction No weld seam – eliminates creep failure risk at high temperature
Wide OD range 6mm to 256mm – covers all superheater pendant sizes
Multiple alloy options SA210 Gr.C (economical) to T91 (high creep strength)
T91 grade Superior creep strength – 50-100% higher than T22 at 1,100°F
Heat treated Proper microstructure for long-term high temperature service
100% NDT tested Eddy current + ultrasonic – detects surface defects that could cause creep failure
Precision tolerances OD: ±0.1mm for sizes
U-bend capability Available for pendant superheater loops
Full traceability EN 10204 3.1 MTC with heat number

U-Bend Superheater Tubes

Feature Capability
Minimum bend radius 1.5× OD (SA210 Gr.C) / 2.0× OD (T91)
Maximum tube OD for U-bend Up to 114mm (4.5″) standard
Leg length tolerance ±1.6mm (±1/16″)
Bend angle 180° standard (custom available)
Stress relief Required after cold bending for T91
Application Pendant superheater loops

Quality Assurance & Testing

Test Method Coverage Critical for Superheater
Eddy Current (ECT) Non-destructive 100% YES – surface defect detection
Ultrasonic (UT) ASTM E213 100% (by agreement) Internal defect detection
Hydrostatic Test Water pressure 100% Leak-proof coils
Tensile Test ASTM E8 Per heat Strength verification
Hardness Test Rockwell/Brinell Per lot T91 ≤250 HB
Flattening Test Ductility Per lot Bendability for U-tubes
Flaring Test Expansion Per lot End integrity for welding
Dimensional Inspection Micrometer 100% Tube-to-baffle fit

Bending & Welding Recommendations

Bending (T91):

  • Minimum bend radius: 2.0 × OD

  • Stress relief after cold bending: Required

  • Hot bending temperature: 1,600-1,800°F (870-980°C)

Welding (T91):

  • Preheat temperature: 200-260°C (400-500°F)

  • PWHT required: Yes

  • Filler metal: ER90S-B9 (9Cr filler)

  • Post-weld cooling: Slow cool (cover with insulation)

⚠️ T91 requires strict preheat and PWHT to prevent hydrogen cracking and maintain creep life.

Mill Test Certificate

  • ASME SA213 / SA210 Certificate of Compliance – Standard

  • EN 10204 Type 3.1 MTC – Provided with heat number

  • EN 10204 Type 3.2 – Available upon request (SGS, BV, TUV, DNV)

  • Heat treatment records – Normalizing, tempering temperatures

  • NDT reports – 100% eddy current + UT (if specified)

  • Traceability: Full traceability from melt to finished tube

Packaging & Shipping

Item Details
Packaging Hexagonal bundles with steel strapping
Protection Anti-rust oil + plastic end caps (carbon steel)
Alloy grades Plastic caps + protective paper
Marking Stencil: Grade, size, heat number, standard, heat treat condition
Documentation MTC + NDT reports + heat treatment records
Lead time 15-25 days (SA210 Gr.C, T11), 25-35 days (T22, T91)
Port Tianjin / Shanghai / Guangzhou

Why Choose Our Seamless Superheater Tubes?

Advantage Description
Wide size range 6mm to 256mm OD – one-stop sourcing
Full grade range SA210 Gr.C, SA213 T11, T22, T91 – match to temperature
T91 in stock Most popular supercritical grade – ready to ship
100% ECT tested Critical for superheater reliability
Heat treated Normalized + tempered for alloy grades
U-bend capability Pendant superheater loops available
Full traceability EN 10204 3.1 MTC with heat number
Global export Shipped to power plants worldwide

Contact for Quote

Please provide the following details:

  • Grade : SA210 Gr.C / SA213 T11 / T22 / T91

  • OD (mm) : _______

  • WT (mm) : _______

  • Length (m) : _______

  • U-bend required? : Yes / No

  • Quantity : _______ (pieces / meters / tons)

  • Steam temperature : _______ °F / °C

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

📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: www.wuxihengzhihui.com

Reply within 24 hours.

FAQ – Seamless Superheater Tube

Q1: What is the difference between SA210 Gr.C and SA213 T91 for superheater service?
A: SA210 Gr.C – medium carbon steel, up to 900°F, economical for low temperature sections. SA213 T91 – 9Cr-1Mo-V alloy, up to 1,200°F, superior creep strength for high temperature superheaters.

Q2: What is the most common superheater tube size?
A: 2″ OD (50.8mm) × 4.0-6.0mm WT – industry standard for high temperature pendant superheaters.

Q3: Can SA210 Gr.C be used for superheater service?
A: Yes, for low temperature superheater sections (steam temperature

Q4: What is the maximum size available?
A: 256mm (10″) OD – suitable for large reheater tubes and superheater headers.

Q5: Does T91 require special bending?
A: Yes – minimum bend radius 2× OD and stress relief after cold bending are required.

Q6: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, DNV, or any customer-specified agency.

Q7: Do you offer free samples?
A: 30cm sample available for common grades (SA210 Gr.C, T91). Shipping fee applies.

Related Products

  • ASME SA213 T91 – High strength superheater tube (this product)

  • ASME SA210 Gr.C – Medium carbon superheater tube (low temp)

  • ASME SA213 T22 – 2.25Cr-1Mo superheater tube

  • ASME SA335 P91 – Alloy steel pipe for superheater headers

  • ASME SA213 TP347H – Austenitic stainless for ultra-supercritical

Tags: Seamless Superheater Tube SA213 T91 Superheater Tube Power Plant Boiler Tube ASME SA210 High Temperature Tube


Seamless steel pipe is manufactured by hot rolling or cold drawing without any weld seam, ensuring uniform wall thickness and high pressure resistance. Common foreign grades include ASTM A106 (high‑temperature service), ASTM A333 (low‑temperature service), DIN 17175, and JIS G3454. To check material properties, search for high‑pressure rating to obtain pressure class standards.

The “seamless” structure maintains excellent mechanical strength under high temperature and high pressure. During production, carbon or alloy steel billets are pierced, elongated, and sized to achieve a high‑quality surface. You can look up seamless finish to understand how different surface finishes affect installation and maintenance – this is especially critical for oil & gas transmission and boiler tubes.

Many seamless pipes require normalising, annealing, or quenching + tempering to relieve internal stresses and improve toughness. For example, ASTM A106 Grade B requires normalising after hot rolling. When selecting materials, refer to technical data on heat treatment to ensure the pipe meets high‑ or low‑temperature service conditions. For corrosive environments, an additional corrosion allowance should be specified.

Carbon seamless steel pipe is a kind of strip steel. Steel pipe with hollow cross-section, a large number of pipes used to transport fluid, such as the transportation of oil, natural gas, gas, water and some solid materials such as pipes. Steel and round steel and other solid steel compared to the same bending strength in the same bending, lighter weight, is an economic section of steel, is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, Bicycle frames and steel construction scaffolding. The use of carbon seamless steel pipe manufacturing ring parts can improve material utilization, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jackets, etc., has been widely used to manufacture steel pipe. 
Seamless steel pipe is manufactured from solid, round steel billets that are pierced through the center with a mandrel. The billet is rolled and stretched through a hollow billet until it reaches a customer's specification. Because of its uniform shape and ability to withstand pressure and heat, seamless steel pipe is an ideal material for many industries.
ZhengDe Metal provides a variety of seamless pipe to meet your application needs, offering a large selection of sizes and lengths. 

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8*1*1.5*2*2.5 127*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38
10*1*1.5*2*2.5*3 133*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40
12*1*1.5*2*2.5*3 140*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42
14*1*1.5*2.5*3*3.5 146*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42
16*1*1.5*2*2.5*3*3.5*4*4.5*5 152*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50
18*1*1.5*2*2.5*3*3.5*4*4.5*5 159*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50
20*1*1.5*2*2.5*3*3.5*4*4.5*5*6 168*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50
22*1*1.5*2*2.5*3*3.5*4*4.5*5*6 180*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50
25*2*2.5*3*3.5*4*4.5*5*6 194*6*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55
28*2*2.5*3*3.5*4*4.5*5*6*8 203*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60
30*2*2.5*3*3.5*4*4.5*5*6*8 219*6*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60*65*70
32*2*2.5*3*3.5*4*4.5*5*6*8 232*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60*65*70
34*2*2.5*3*3.5*4*4.5*5*6*8 245*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60*65*70
38*2*2.5*3*3.5*4*4.5*5*6*8*10*12 273*6.5*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60*65*70*75*80
40*3*3.5*4*4.5*5*6*8*10*12 299*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*50*55*60*65*70*75*80*100
42*3*3.5*4*4.5*5*6*8*10*12 325*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*75*80*100
45*3*3.5*4*4.5*5*6*8*10*12*14 351*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*75*80*100
48*3*3.5*4*4.5*5*6*8*10*12*14 377*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*75*80*100
50*3*3.5*4*4.5*5*6*8*10*12*14*15*16 402*7*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*100*110
51*3.5*4*4.5*5*6*8*10*12*14*15*16 406*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*70*75*80*90*100*110
54*3.5*4*4.5*5*6*8*10*12*14*16 426*8*10*12*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*75*80*120*130
57*3.5*4*4.5*5*6*8*10*12*14*16 450*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*48*50*55*75*80*90*100*110*120
60*3.5*4*4.5*5*6*8*10*12*14*16*18*20 457*8*10*12*14*20*22*25*28*30*32*35*38*40*42*45*48*50*55*60*65*70*75*130*140*150
63.5*3.5*4*4.5*5*6*8*10*12*14*16*18*20 480*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*50*55*60*100*110*120*130*140*150
65*3.5*4*4.5*5*6*8*10*12*14*16*18*20 500*8*10*12*14*16*18*20*22*25*28*30*32*35*38*40*42*45*55*60*65*70*75*80*90*100*110
68*3.5*4*4.5*5*6*8*10*12*14*16*18*20 508*8*10*12*14*16*18*20*22*25*28*30*32*35*45*48*50*55*90*100*110*120*130*140*150
70*3.5*4*4.5*5*6*8*10*12*14*16*18*20*22 530*8*10*12*14*16*18*20*22*25*28*30*32*35*38*48*50*55*90*100*110*120*130*140*150
73*3.5*4*4.5*5*6*8*10*12*14*16*18*20*22 560*8*10*12*14*16*1828*30*32*35*38*40*42*45*48*80*90*100*110*120*130*140*150
76*3.5*4*4.5*5*6*8*10*12*14*16*18*20*22*25 580*10*12*14*16*18*25*28*30*32*35*38*40*42*45**60*65*70*75*80*90*100*110*120*130
80*4*4.5*5*6*8*10*12*14*16*18*20*22*25 600*10*12*14*16*22*25*28*30*32*50*55*60*65*70*75*80*90*100*110*120*130*140*150
83*4*4.5*5*6*8*10*12*14*16*18*20*22*25 610*10*14*16*18*22*25*28*30*32*35*50*55*60*65*70*75*80*90*100*110*120*130*140*150
89*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28 630*10*12*14*16*22*25*28*30*48*50*55*60*65*70*75*80*90*100*110*120*130*140*150
95*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30 700*10*12*14*16*22*40*42*45*48*50*55*60*65*70*75*80*90*100*110*120*130*140*150
102*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32 710*10*12*14*16*18*40*42*45*48*50*55*60*65*70*75*80*90*100*110*120*130*140*150
108*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32 720*10*12*14*16*18*20*22*25*28*30*50*55*60*65*70*75*80*90*100*110*120*130*140*150
114*4*4.5*5*6*8*10*12*14*16*18*20*22*25*28*30*32 760*10*12*20*22*25*28*30*50*55*60*65*70*75*80*90*100*110*120*130*140*150*200



Product Tags: DIN 2391 ST35.4 , automotive seamless tube , wholesale DIN pipe

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Year Established
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