Descripción del producto

ASTM A**2 seamless stainless steel pipes for general corrosive service
 
We manufacturing and supply seamless austenitic stainless steel pipes intended for high-temperature and general corrosive service.
 
Grades **4H, **9H, **0H, **6H, **1H, **7H are intended for high-temperature service.
 
Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. There supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.
 
The standardized dimensions of seamless stainless steel pipe as shown in ANSI B*6.*9. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
 
Grades TP**1 and TP**1H have lower strength requirements for pipe manufactured by the seamless process in nominal wall thicknesses greater than 3/8 in. [9.5 mm].
 
Referenced Documents
1. ASTM Standards
A **2 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A **0 Test Methods and Definitions for Mechanical Testing of Steel Products
A **0/A **0M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
A **1 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A **9/A **9M Specification for General Requirements for Alloy and Stainless Steel Pipe
E **2 Test Methods for Determining the Average Grain Size
E **1 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
E **7 Practice for Numbering Metals and Alloys (UNS)4\
 
2. ANSI Standards
B1.*0.1 Pipe Threads, General Purpose
B*6.*0 Welded and Seamless Wrought Steel Pipe
B*6.*9 Stainless Steel Pipe
 
3. ASME Standard
ASME Boiler and Pressure Vessel Code: Section VIII
 
Ordering Information
1. Orders for material to this specification should include the following, as required, to describe the desired material adequately:
1.1 Quantity (feet, centimetres, or number of lengths),
1.2 Name of material (austenitic steel pipe),
1.3 Process (seamless (SML) or welded (WLD) or heavily cold worked (HCW) ),
1.4 Grade (Table 1),
1.5 Size (NPS or outside diameter and schedule number or average wall thickness),
1.6 Length (specific or random) (Section *3),
1.7 End finish (Section on Ends of Specification A **9/A **9M),
1.8 Optional requirements (product analysis, see Section 8; hydrostatic or nondestructive electric test),
1.9 Test report required (Certification Section of Specification A **9/A **9M),
1.*0 Specification number, and
1.*1 Special requirements or any supplementary requirements selected, or both.
 
Materials and Manufacture
1. Manufacture:
1.1 The pipe shall be manufactured by one of the following processes:
1.2 Seamless pipe shall be made by a process that does not involve welding at any stage of production.
1.3 At the option of the manufacturer, pipe shall be either hot finished or cold finished.
1.4 The pipe shall be free of scale and contaminating exogenous iron particles. Pickling, blasting, or surface finishing is not mandatory when pipe is bright annealed. The purchaser is permitted to require that a passivating treatment be applied to the finished pipe.
 
2. Heat Treatment- All pipe shall be furnished in the heat-treated condition. Alternatively, for seamless pipe, immediately following hot forming while the temperature of the pipes is not less
than the specified minimum solution treatment temperature, pipes may be individually quenched in water or rapidly cooled by other means.
 
3. Grain Size:
3.1 The grain size of grades TP**9H, TP**9HCb, TP**0H and TP**0HCb, as determined in accordance with Test Methods E **2, shall be No. 6 or coarser.
3.2 The grain size of grades **4H, **6H, **1H, **7H, and **8H, as determined in accordance with Test Methods E **2, shall be No. 7 or coarser.
 
Hydrostatic or Nondestructive Electric Test
1. Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test. They type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
2. The hydrostatic test shall be in accordance with Specification A **9/A **9M, unless specifically exempted under the provisions of 3.
3. For pipe whose dimensions equal or exceed NPS*0, the purchaser, with the agreement of the manufacturer, may waive the hydrostatic test requirement when in lieu of such test the purchaser performs a system test. Each length of pipe furnished without the completed manufacturers hydrostatic test shall include with the mandatory markings the letters NH.
4. Nondestructive Electric Test:
Nondestructive electric tests shall be in accordance with Specification A **9/A **9M.
 
Lengths
1. Pipe lengths shall be in accordance with the following regular practice:
1.1 Unless otherwise agreed upon, all sizes from NPS 1/8 to and including NPS 8 are available in a length up to *4 ft (Note 4) with the permissible range of *5 to *4 ft (Note 4). Short lengths are acceptable and the number and minimum length shall be agreed upon between the manufacturer and the purchaser.
1.2 If definite cut lengths are desired, the lengths required shall be specified in the order. No pipe shall be under the specified length and not more than 1/4 in. [6 mm] over that specified.
1.3 No jointers are permitted unless otherwise specified.
 
Marking
In addition to the marking specified in Specification A **9/A **9M, the marking shall include the NPS (nominal pipe size) or outside diameter and schedule number or average wall thickness, heat number, and NH when hydrotesting is not performed and ET when eddy-current testing is performed or UT when ultrasonic testing is performed. The marking shall also include the manufacturers private identifying mark For Grades TP**4H, TP**6H, TP**1H, TP**7H, TP**8H, and S****5, the marking shall also include the heat number and heat-treatment lot identification. If specified in the purchase order, the marking for pipe larger than NPS 4 shall include the weight.
 
Steel grades
**4, **4L, **4H, **1, **1H, **6, **6L, **7L, **0S, **7H, S****5, S****0, S****0
 
Dimensional range
Outside diameter: ****0 mm
Wall thickness: ***0 mm
Length: 4,**0 - *0,**0 mm
 
NPS 1/8**0
Sch 5S***0
 
Typical materials and sizes in our hot sales (mm)
**6L, OD**0 x WT*0.0 (≤OD**0 mm)
S****3/S***5, OD**4 x WT5.0 (≤OD**4 mm)
**4H, **7H, OD**4 x WT6.0, OD**8 x WT5.0, OD**9 x WT6.0 (≤OD**9 mm)
**1, **6L, OD**4 x WT4.5, OD**8 x WT4.5, OD**3 x WT7.5 (≤OD**3 mm)
 
Approved certification
ABS ISO***1:***8, PED *7/*3/EC 7/2, BV, CE, TUV AD***0 WO, LLODYS, DNV, CCS, ISO ****1:***4, OHSAS ****1:***7, API*5LC