ASTM A269 Seamless and Welded Austenitic Stainless Tubing
ASTM A269 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service1
1 Scope
1.1 This specification applies to the nominal wall thickness stainless steel pipe, which is usually resistant to corrosion, too high and undercooling equipment, as shown in Table 1.
1.2 tube diameter 1/4 inch or more, nominal wall thickness 0.020 inches or more.
1.3 Mechanical properties Not applicable for pipes with an inner diameter less than 1/8 in. Or a wall thickness of less than 0.015 inches. Note 1: The remaining test requirements can be applied to ASME B31.3.
1.4 Non-mandatory ancillary requirements should be stated in the order. 1.5 This specification is in inches - pounds units.
2. Referenced documents
2.1 ASTM standards
Application of A262 Magnetic Flaw Detection Stainless Steel Tube.
Test methods and definitions for mechanical properties of A370 steel products.
A480 / A480M General requirements for rolling stainless steel plate and heat-resistant steel plate standard.
A632 General equipment for seamless and welded austenitic stainless steel tubes
A1016 / 1016M general requirements with ferrite alloy steel, austenitic alloy steel and stainless steel pipe.
E527 large number of metal and alloy steel applications.
2.2 ASME pipe fittings: ASME B31.3 pipe fittings process
2.3 Other standards: SAE J1086 large number of metal and alloy steel applications.
3. Ordering Information
3.1 The order material includes the following
3.1.1 Quantity (feet, meters, or length)
3.1.2 Material name (seamless or welded pipe)
3.1.3 Rank (Table 1)
3.1.4 Dimensions (outside diameter and nominal wall thickness)
3.1.5 Length (accurate or free)
3.1.6 Non-mandatory requirements (heat treatment, see 6; hydrostatic or non-destructive electric tests, see 10)
3.1.7 Test report requirements (see A1016 / A1016M standard test section)
3.1.8 detailed
3.1.9 Special requirements and some optional supplementary requirements
4. General requirements
4.1 If there is no other description, this specification material requirements refer to A1016 / A1016M
5. Manufacture
5.1 Tubes are manufactured in a seamless and soldering process
5.2 Producers choose hot or cold working
6. Heat treatment
6.1 All materials should be heat treated. Other materials such as S31254 and S32654 (see 6.3), S24565 (see 6.4), N08367 (see 6.8), N08904 (see 6.5) and N0826 (see 6.7) are heated to a minimum of 1040 After the rapid cooling of water or other rapid cooling methods. For seamless, when the temperature reaches the minimum temperature in the description, it can be individually water cooled or other rapid cooling.
6.2 The particular structure or equipment will be described in detail in the most appropriate heat treatment. If the final heat treatment temperature is below 1040 ° C and stated in the order, each tube should be printed with a Fahrenheit temperature after the subscript "HT".
6.3 S31254 and S32654 heat treatment minimum temperature 1150 ℃, using rapid water cooling or other rapid cooling method.
6.4 S24565 heat treatment temperature is 1120-1170 ℃, rapid water cooling or other rapid cooling mode.
6.5 N08904 heat treatment minimum temperature of 1100 ℃, the use of rapid water cooling or other rapid cooling.
6.6 After the TP321, TP347 and TP348 photosensitive treatment, the annealing temperature above 1065 ℃ may damage the granular structure within the tissue. When the buyer details, you can use low-temperature annealing or re-annealing, followed by the initial high-temperature annealing (see auxiliary requirements S3).
6.7 N08926 heat treatment minimum temperature of 1100 ℃, the use of rapid water cooling or other rapid cooling.
6.8 UNS N08367 should be annealed from the lowest temperature of 1107 ° C, followed by rapid cooling.
6.9 S35045, heating to a minimum of 1093 ℃ to maintain the appropriate time, using air cooling or faster cooling rate.
7. Chemical composition
8. Product analysis
8.1 Chemical composition of coarse bar, bar or pipe Refer to the detailed description.
8.2 Using the product analysis tolerances in A480 / A480M Table A1.1, the product tolerance is not suitable for materials with a maximum carbon content of less than 0.04%.
8.3 If the initial product analysis test fails, test another 2 thick bars, rods or pipes. 2 times the element test should meet the requirements; otherwise the producers choose to re-heat treatment or scrap in batches, you can independently test the rough bar, rolling rods or pipes, if the test does not meet the requirements, must be scrapped.
9. Mechanical Tests Required
9.1 Spark Test (Seamless Tube) - Extract samples from the end of each batch of finished pipe.
9.2 Flange test (welded pipe) - Extract samples from the end of each batch of finished pipe.
9.3 Hardness test - Two tubes were selected from each batch to test Brinell hardness or Rockwell hardness. The item is suitable for all pre-cut fittings, nominally the same diameter and wall thickness of the equivalent heat treated steel. The final heat treatment in a furnace, a batch refers to the same furnace heat treatment, the same size of the pipe. When the final heat treatment is carried out by a continuous furnace, or the heat treatment state is obtained directly from the quenching, a batch refers to all the same size, at the same time, the same treatment process heat treatment of the pipe.
9.4 When there are more than one heat treatment, each must undergo a spark test and a hardness test
9.5 Yield test - For welded pipes, a sample is made on every 1500 ft of finished pipe, and a length of more than 1500 feet (460 m) of tubing is made from both ends. No welding connections are made.
10. Hydrostatic or non-destructive electric test
10.1 Each pipe must be hydrostatic or non-destructive, and the purchase order can be selected by a manufacturer without any special instructions.
11. Hardness requirements
TPXM-11, TPXM-11 and TPXM-19 hardness not exceeding 269HB / 285HV or 25HRC, S31254 hardness does not exceed 220HB / 230HV or 96HRB, the hardness of the TPXM-29, S24565, N08367 and N08926 fittings does not exceed 256HB / 270HV or 100HRB, S32654 hardness of not more than 250HB / 263HV or 100HRB, other grades of pipe hardness of not more than 192HB / 200HV or 90HRB.
11.2 For pipes with wall thickness less than 0.065 in. (1.65 mm), Rockwell hardness or Vickers hardness is allowed, and when using Vickers hardness, reference is given to 11.1. TPXM-10 TPXM-11 TPXM-11 TPXM-11 does not exceed 46 and 73, S31254 does not exceed 79 and 91, and other grades are not available on the corresponding scale. Not more than 74 and 88.
11.3 The diameter of less than 1/4 inch (6.4mm) or wall thickness of less than 0.020 inches (0.51mm) of the pipe does not require hardness test, according to A632, this diameter or thin-walled tube only tensile test.
12. Permissible Variationsin Dimensions
12.1 Outside diameter, wall thickness and length The dimensional change does not exceed the values shown in Table 3.
12.2 In Table 3, the permissible range of variation for the outer diameter of a thin-walled elliptical tube is not sufficient and the maximum and minimum diameters of any cross-section of such pipe fittings will exceed the nominal diameter of not more than 2 times the allowable variation in Table 3. However, this means that the cross-sectional diameter is within the permissible range of variation.
13. Surface Condition
13.1 The pipe should be pickled, and when the annealing process is used, pickling is not necessary.
14. Product Marking
14.1 In addition to the marks mentioned in A1016 / A1016M, the marking also includes either seamless or welded. If the final heat treatment temperature is below 1900 ° F (1040 ° C), the "HT" suffix must be marked with a heat treatment temperature of Fahrenheit.
14.2 When a non-destructive electric test is to be carried out, each length of the pipe must be marked "NDE" and the certificate, and when it is necessary, this means that the test is to be done.
15. Keywords
15.1 austenitic stainless steel, seamless steel pipe, stainless steel pipe, steel pipe, welded steel pipe
Ancillary requirements
The following subordinate requirements are only available to purchasers in the inquiry, contract, and order
S1.Stress-Relieved Annealed Tubes
S1.1 for corrosive, especially chloride, can be described in TP304L, TP316L, TP321, TP347 and TP348 as pressure relief tubes.
S1.2 When the pressure tube is specified, it should be heat treated at 1550 ° F (845 ° C) to 1650 ° F (900 ° C) after crimping straightening, followed by air cooling or slow cooling, allowing straightening after decompression.
S1.3 pipe straightness and other ancillary requirements, can be coordinated by the supplier and the purchaser.
S2.Air Underwater Pressure Test
UnderwaterPressureTest
S2.1 When required, the pipe needs to be hydrostatic test
S3. Stabilizing Heat Treatment
S3.1 Section 6, TP321, TP347 and TP348 should be subjected to a heat treatment process which is lower than the initial heat treatment temperature. The heat treatment temperature can be solved by the supplier and the purchaser.
S4. Intergranular Corrosion Test
S4.1 When required, according to Test A262, Test E, the manufacturer conducts a metallographic test of the material
S4.2 For titanium or niobium-containing materials, the supplier shall perform a stable heat treatment according to S3.