Payment & Shipping Terms:
|Product Name:||ASTM A335 P91 Seamless Alloy-Steel Pipe||OD:||12mm-620mm|
|Shape:||Round||Standard:||ASTM, AISI, JIS, DIN, EN, GB|
|Certification:||CE, ISO, BV, SGS||Technique:||Seamless|
Astm A335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service
ASTM A335 standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ュ) indicates an editorial change since the last revision or reapproval.
1.1This specification covers nominal (average) wall seamless alloy-steel pipe intended for high-temperature service (Mote 1). Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
NOTE 1 Α Appendix X1 lists the sizes and wall thicknesses of pipe which may be obtained under current commercial practice.
1.2 Several grades of ferritic steels (Note 2) are covered. Their compositions are given in Table 1.
ΑFerritic steels in this specification are defined as low and intermediate-alloy steels containing up to and including 10％ chromium.
1.3 Supplementary requirements (S1 to S7) of an optional nature are provided. These supplementary requirements call for additional tests to be made, and when desired, shall be so stated in the order together with the number of such tests required.
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
Note 3ΑThe dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as "nominal diameter," "size," and "nominal size."
A / N+T
N+T / Q+T
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
|Grade||Heat Treatment Type
P5, P9, P11, and P22
|Normalizing Temperature Range F [C]||Subcritical Annealing or Tempering
Temperature Range F [C]
|A335 P5 (b,c)||Full or Isothermal Anneal|
|Normalize and Temper||*****||1250 |
|Subcritical Anneal (P5c only)||*****||1325 – 1375 [715 - 745]|
|A335 P9||Full or Isothermal Anneal|
|Normalize and Temper||*****||1250 |
|A335 P11||Full or Isothermal Anneal|
|Normalize and Temper||*****||1200 |
|A335 P22||Full or Isothermal Anneal|
|Normalize and Temper||*****||1250 |
|A335 P91||Normalize and Temper||1900-1975 [1040 - 1080]||1350-1470 [730 - 800]|
|Quench and Temper||1900-1975 [1040 - 1080]||1350-1470 [730 - 800]|
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
Notes for Hardness Test:
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Notes for Bend Test:
For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
The inside diameter of the bend shall be 1 inch [25 mm].
Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used.
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
|Quantity||Feet, meters, or number of lengths|
|Name of material||Seamless Alloy Steel Pipe|
|Grade||P5, P9, P11, P22, P91|
|Manufacture||Hot-finished or cold-drawn|
|Size using one of the following:|
|NPS and Schedule Number|
|Outside Diameter and Nominal Wall Thickness|
|Outside Diameter and Minimum Wall Thickness|
|Inside Diameter and Nominal Wall Thickness|
|Inside Diameter and Minimum Wall Thickness|
|Length||Specific or Random|
Usage: Hydraulic Pipe, Fluid Pipe, physical construction, hydraulic device, automobile parts, Steel sleeve, bearing, hydraulic cylinder, Pneumatic cylinder and hydraulic pipe
Standard: ISO, JIS, GB, DIN, ASTM, API
2) Drawing of Precision Pipe
3) Product Size Specification Table (mm) (Blue Area)
Remark: We also produce customized sizes out of this list
4) Chemical composition
Chemical composition of precision pipe in frequently used grade
|Standard||Grade||Chemical composition (%)|
5) Mechanical properties
Mechanical properties of common precision pipe
|Cold finished (hard)(BK)||Cold finished (Soft) BKW|
|UTS(Ultimate Tensile Strength)||percentage elongation after fracture||UTS(Ultimate Tensile Strength)||percentage elongation after fracture|
|σ b (Mpa)||δ 5(%)||σ b (Mpa)||δ 5(%)|
Cold Finished (Hard): Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
Cold Finished (Soft): The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)
6) Product Application Industry
Mechanical processing, machinery manufacturing, automobile
7) Quality Control
A. Advanced Production Equipment
B. Production Flow
C. Skill-full and Qualfied Workers, Training and Testing before Working
D. Strictly Qualtity Control System
8) Packing & Shipping
A) Packing Method
Small size in bundles, big size in bulk, with plastic cap to protect both ends, seaworthy packaging or as per customer's requests.
B) Shipping Way
As per customer's request.
Usually by Sea, by Air, by Train or River-and-Sea Coordinated Transport.
Q: What about your payment term?
A: Usually T/T or L/C, 30% deposit and 70% before delivery.
Q: what about your standard delivery date ?
A: 30 days after receiving deposit
Q: How about your capacity ?
A: For steel pipes, 50,000 tons per month, 600,000 tons per year. For pipe fittings, 30,000 tons per year
Q: what about your package ?
A: Usually as per customer's requests.
Common packing information: Small size in bundles, big size in bulk, some sizes with plastic cap to protect both ends, seaworthy packaging.
Q: What is your main market &main customers ?
A: We have 12 years experience on steel pipes & pipe fittings. Our main market includes China, Singapore etc. Main Customers including HYST, Keppel group etc.
Q: If products have some quality problem,how would you deal with?
A: We will responsible for all of our quality problems.
Q: How to get accurate price / quotation from you?
A: Please kindly tell us below details and we'll send our quotation to you ASAP:
1) Pipe's outer diameter
2) Wall thickness
3) Section Shape (round, square etc.)
4) Length for each pipe
5) Steel grade
6) Standard (e.g.: API 5L)
7) Order quantity
8) Designation (BK, BKW etc.)
9) Trade Terms
P.S.: more detailed information you clarified, more exact price we provided.
Contact Person: Gao Ben