TOBO STEEL GROUP CHINA
| Section Shape | Round |
| Invoicing | by actual weight |
| Payment Terms | T/T,Western Union |
| Supply Capacity | 10000tons |
| Certifications | ISO/EN 10204 Type 3.1 / 3.2 available |
| Applications | Oil & Gas, Chemical, Food Processing, Construction |
| Supply Ability | 10 Ton/Month |
| Product Name | ASTM A213 Stainless Steel Seamless Pipe TP304/TP316L Bright Annealed Seamless Tube for Heat Exchanger |
| Standard | ASTM, AISI, DIN, EN, GB, JIS, etc. |
| Delivery Time | 15-30 Workdays |
| Origin | China |
| Term Name | Stainless Steel Pipe |
| Corrosionresistance | High |
| Mechanicalproperties | High tensile strength and ductility |
| Welding Line Type | Seamless,ERW,Spiral Welded |
| Processing Service | Seamless |
| Outer Diameter | 6-530mm Or Customized |
| Packaging Details | Standard Shipping Package |
| Face | Black |
| Technique | Hot Rolled |
| Model Number | Stainless Steel Seamless Pipe |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Section Shape | Round | Invoicing | by actual weight |
| Payment Terms | T/T,Western Union | Supply Capacity | 10000tons |
| Certifications | ISO/EN 10204 Type 3.1 / 3.2 available | Applications | Oil & Gas, Chemical, Food Processing, Construction |
| Supply Ability | 10 Ton/Month | Product Name | ASTM A213 Stainless Steel Seamless Pipe TP304/TP316L Bright Annealed Seamless Tube for Heat Exchanger |
| Standard | ASTM, AISI, DIN, EN, GB, JIS, etc. | Delivery Time | 15-30 Workdays |
| Origin | China | Term Name | Stainless Steel Pipe |
| Corrosionresistance | High | Mechanicalproperties | High tensile strength and ductility |
| Welding Line Type | Seamless,ERW,Spiral Welded | Processing Service | Seamless |
| Outer Diameter | 6-530mm Or Customized | Packaging Details | Standard Shipping Package |
| Face | Black | Technique | Hot Rolled |
| Model Number | Stainless Steel Seamless Pipe | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | ASTM A213 stainless steel seamless pipe ，TP304 TP316L bright annealed tube ，heat exchanger stainless steel tube | ||
ASTM A213 Stainless Steel Seamless Pipe TP304/TP316L Bright Annealed Seamless Tube for Heat Exchanger
1.Product Description
This document provides technical basis for the life-cycle operation and maintenance management of stainless steel seamless pipes that have been installed and are in service. Unlike the original mill quality certificates, this version focuses on the performance degradation patterns of pipes under combined loads (high temperature, high pressure, corrosion, fatigue), in-service inspection methods, defect assessment criteria, and remaining life evaluation methodologies. Since seamless pipes have no longitudinal welds, special scanning schemes for weld zones are unnecessary during in-service inspections, resulting in higher inspection coverage and lower misjudgment rates. This makes them particularly suitable for integrity management of critical safety-rated (SIL-2 and above) piping systems.
2. Product Applications
| Service Phase | Specific Work Content |
| Within 6 months of first commissioning | Establish baseline wall thickness reference (zero baseline for corrosion monitoring via UT thickness measurement) |
| Routine on-line monitoring | Fixed-point thickness gauging (select high-corrosion-risk points, re-measured monthly/quarterly) |
| Planned turnaround overhaul | Full wall thickness scanning + spot PT (penetrant testing) + spot hardness checks |
| Post-upset event assessment | Rapid integrity assessment of affected pipe sections after over-temperature/over-pressure/water hammer events |
| Pre-life-extension evaluation | Recalculate remaining design life based on measured minimum wall thickness and current mechanical properties |
| Replacement decision support | Determine whether localized or full replacement is required when thickness falls below the design minimum |
3. Product Advantages
Sufficient uniform corrosion allowance: Seamless pipes are manufactured with reserved corrosion allowance (typically 1.0~3.0mm, depending on media corrosivity) per design codes. The absence of localized accelerated corrosion risks in weld zones ensures predictable and uniform wall thinning rates, facilitating precise maintenance and replacement scheduling.
Minimal NDT signal interference: No acoustic interference from coarse-grained weld zones or HAZ structural inhomogeneities. Ultrasonic attenuation coefficients remain stable along the pipe body, yielding thickness measurement repeatability of ≤±0.05mm with high confidence in results.
Clear defect tolerance limits: Critical sizes for volumetric defects (e.g., pitting, erosion) in seamless pipes can be precisely assessed per API 579 / ASME FFS-1 without overly conservative premature replacement due to weld joint coefficient reductions.
Repairability and re-manufacturing friendliness: Localized wear or corrosion thinning can be restored via weld overlay cladding or repair sleeve installation. The seamless pipe's excellent roundness ensures high sleeve fitment, with repair strength recovering to ≥95% of original design values.
Simplified record management: A single pipe section can reach over 12m in length with no weld interruptions. Fixed-position thickness monitoring points can be permanently marked, enabling strong data comparability over long-term tracking and significantly reducing data analysis and trend prediction workloads.
4.Key Product Parameters
| Assessment Item | Operational Reference / Execution Basis |
| Minimum allowable wall thickness (in-service) | Back-calculated per design formula: t_min = (P·D)/(2·S·E + 2·P·Y) + consumed corrosion allowance limit |
| Reference uniform corrosion rate (304/316, neutral water) | 0.01 ~ 0.05 mm/year (adjust based on actual media) |
| Pitting/local thinning depth limit (unrepaired) | ≤ 40% of nominal wall thickness (API 579 Level 1) |
| UT thickness inspection frequency | General lines: once/year; high-risk (Cl⁻/H₂S): once/six months; SHC-2 rated: once/quarter |
| Thickness measurement point density | Straight sections: 1 cross-section per 3 meters, 4 azimuths per section (0°, 90°, 180°, 270°); elbows/tees: densified to 1 section per meter |
| On-site hardness limit (post-service austenitic) | Base metal hardness increase >30 HB above as-delivered value indicates σ-phase embrittlement risk; metallographic verification required |
| Hydrostatic retest pressure (in-service) | 1.25 × MAWP (Maximum Allowable Working Pressure), hold ≥15 minutes, acceptance: no leakage |
| Leak-tightness acceptance standard | Helium leak test ≤ 1×10⁻⁵ Pa·m³/s (vacuum service); soap solution: no continuous bubbles (atmospheric service) |
| Vibration velocity limit (RMS, power frequency) | New lines ≤ 10mm/s; In-service lines ≤ 15mm/s; >25mm/s requires immediate shutdown |
| Simplified remaining life estimation | R_L = (t_actual - t_min) / corrosion rate (years), with 50% safety factor applied as recommended replacement horizon |
| Inspection report retention period | Minimum 15 years (statutory requirement for pressure piping) or project-specified full life-cycle duration |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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