Titanium and titanium alloy seamless tubes
Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage, and contract contents for titanium and alliage de titane tubes. This standard applies to seamless titanium and titanium alloy tubes produced by cold rolling (cold drawing) and titanium and alloy tubes produced by welding and welding rolling methods.
This standard applies to titanium and alloy tubes used in the manufacture of heat exchangers, condensers, and various pressure vessels.
Normative References
The following documents, in their entirety, by reference in this standard, constitute the provisions of this standard. When referenced documents have dates of issue, subsequent amendments (excluding errata) or revisions do not apply to this standard. Cependant, parties to agreements based on this standard are encouraged to investigate the possibility of using the most recent versions of these documents. When documents without dates of issue are referenced, the latest version applies to this standard.
- GB/T228 Test method for tensile test of metallic materials at room temperature
- GB / T 241 Test method for hydraulic test of metal tubes
- GB / T 242 Test method for expanding test of metal tubes
- GB/T246 Test method for flattening test of metal tubes
- GB/T3620.1 Grades and chemical composition of titanium and titanium alloys
- GB/T3620.2 Allowable deviations in chemical composition of titanium and titanium alloy processed products
- GB/T4698(All parts) Chemical analysis methods for sponge, titanium and titanium alloys
- GB/T8180 Packaging, marking, transportation and storage of titanium and titanium alloy processed products
- GB / T 12969 Ultrasonic and eddy current testing methods for titanium and titanium alloy tubes
Requirements
3.1 Product Classification
3.1.1 Grade, State and Specification of Products
3.1.1.1 The grade, state and specification of cold-rolled seamless titanium and titanium alloy tubes shall comply with the provisions of Table 1
Table 1: Grade, state and specification of cold-rolled seamless titanium and titanium alloy tubes
| Grade | State | Outer diameter (mm) | Wall thickness (mm) | Length (m) |
|---|---|---|---|---|
| TA0 | A | ≤40 | ≤1.6 | ≤8 |
| B | ≤40 | ≤1.6 | ≤4 | |
| C | ≤40 | ≤1.6 | ≤2 | |
| H | ≤40 | ≤1.6 | ≤1 | |
| TA1 | A | ≤40 | ≤2.0 | ≤8 |
| B | ≤40 | ≤2.0 | ≤4 | |
| C | ≤40 | ≤2.0 | ≤2 | |
| H | ≤40 | ≤2.0 | ≤1 | |
| TA2 | A | ≤40 | ≤3.0 | ≤8 |
| B | ≤40 | ≤3.0 | ≤4 | |
| C | ≤40 | ≤3.0 | ≤2 | |
| H | ≤40 | ≤3.0 | ≤1 | |
| TA3 | A | ≤40 | ≤1.6 | ≤8 |
| B | ≤40 | ≤1.6 | ≤4 | |
| C | ≤40 | ≤1.6 | ≤2 | |
| H | ≤40 | ≤1.6 | ≤1 | |
| TA9 | A | ≤40 | ≤2.0 | ≤8 |
| B | ≤40 | ≤2.0 | ≤4 | |
| C | ≤40 | ≤2.0 | ≤2 | |
| H | ≤40 | ≤2.0 | ≤1 | |
| TA10 | A | ≤40 | ≤3.0 | ≤8 |
| B | ≤40 | ≤3.0 | ≤4 | |
| C | ≤40 | ≤3.0 | ≤2 | |
| H | ≤40 | ≤3.0 | ≤1 |
3.1.1.2 The grade, state and specification of welded tubes shall comply with the provisions of Table 2.
Table 2: Grade, state and specification of welded tubes
| Grade | State | Outer diameter (mm) | Wall thickness (mm) | Length (m) |
|---|---|---|---|---|
| TA0 | A | ≤168 | ≤4.0 | ≤12 |
| B | ≤168 | ≤4.0 | ≤8 | |
| C | ≤168 | ≤4.0 | ≤6 | |
| D | ≤168 | ≤4.0 | ≤4 | |
| E | ≤168 | ≤4.0 | ≤2 | |
| H | ≤168 | ≤4.0 | ≤1 | |
| TA1 | A | ≤168 | ≤5.0 | ≤12 |
| B | ≤168 | ≤5.0 | ≤8 | |
| C | ≤168 | ≤5.0 | ≤6 | |
| D | ≤168 | ≤5.0 | ≤4 | |
| E | ≤168 | ≤5.0 | ≤2 | |
| H | ≤168 | ≤5.0 | ≤1 | |
| TA2 | A | ≤168 | ≤6.0 | ≤12 |
| B | ≤168 | ≤6.0 | ≤8 | |
| C | ≤168 | ≤6.0 | ≤6 | |
| D | ≤168 | ≤6.0 | ≤4 | |
| E | ≤168 | ≤6.0 | ≤2 | |
| H | ≤168 | ≤6.0 | ≤1 | |
| TA3 | A | ≤168 | ≤4.0 | ≤12 |
| B | ≤168 | ≤4.0 | ≤8 | |
| C | ≤168 | ≤4.0 | ≤6 | |
| D | ≤168 | ≤4.0 | ≤4 | |
| E | ≤168 | ≤4.0 | ≤2 | |
| H | ≤168 | ≤4.0 | ≤1 | |
| TA9 | A | ≤168 | ≤5.0 | ≤12 |
| B | ≤168 | ≤5.0 | ≤8 | |
| C | ≤168 | ≤5.0 | ≤6 | |
| D | ≤168 | ≤5.0 | ≤4 | |
| E | ≤168 | ≤5.0 | ≤2 | |
| H | ≤168 | ≤5.0 | ≤1 | |
| TA10 | A | ≤168 | ≤6.0 | ≤12 |
| B | ≤168 | ≤6.0 | ≤8 | |
| C | ≤168 | ≤6.0 | ≤6 | |
| D | ≤168 | ≤6.0 | ≤4 | |
| E | ≤168 | ≤6.0 | ≤2 | |
| H | ≤168 | ≤6.0 | ≤1 |
3.1.1.3 The grade, state, and specification of titanium and titanium alloy tubes produced by the welding-rolling method shall comply with the provisions of Table 3.
Table 3: Welding-rolled tubes
| Grade | State | Outer diameter (mm) | Wall thickness (mm) | Length (m) |
|---|---|---|---|---|
| TA0 | A | ≤40 | ≤3.0 | ≤8 |
| B | ≤40 | ≤3.0 | ≤4 | |
| C | ≤40 | ≤3.0 | ≤2 | |
| H | ≤40 | ≤3.0 | ≤1 | |
| TA1 | A | ≤40 | ≤4.0 | ≤8 |
| B | ≤40 | ≤4.0 | ≤4 | |
| C | ≤40 | ≤4.0 | ≤2 | |
| H | ≤40 | ≤4.0 | ≤1 | |
| TA2 | A | ≤40 | ≤5.0 | ≤8 |
| B | ≤40 | ≤5.0 | ≤4 | |
| C | ≤40 | ≤5.0 | ≤2 | |
| H | ≤40 | ≤5.0 | ≤1 | |
| TA3 | A | ≤40 | ≤3.0 | ≤8 |
| B | ≤40 | ≤3.0 | ≤4 | |
| C | ≤40 | ≤3.0 | ≤2 | |
| H | ≤40 | ≤3.0 | ≤1 | |
| TA9 | A | ≤40 | ≤4.0 | ≤8 |
| B | ≤40 | ≤4.0 | ≤4 | |
| C | ≤40 | ≤4.0 | ≤2 | |
| H | ≤40 | ≤4.0 | ≤1 | |
| TA10 | A | ≤40 | ≤5.0 | ≤8 |
| B | ≤40 | ≤5.0 | ≤4 | |
| C | ≤40 | ≤5.0 | ≤2 | |
| H | ≤40 | ≤5.0 | ≤1 |
3.1.2 Marking Examples
Product marking is expressed in the order of product name, grade, production method, state, specification, and standard number. Examples of marking are as follows:
Example 1:
TA2 cold-rolled seamless tube produced in accordance with this standard, annealed state, outer diameter 36mm, wall thickness 4mm, length 3000mm, marked as:
Pipe TA2 SM Ø36x4x3 000 GB / T 3625-2007
Example 2:
TAI welded tube produced in accordance with this standard, annealed state, outer diameter 25mm, wall thickness 0.6mm, length 4000mm, marked as:
Pipe TAIWM Ø25×0.6×4 000 GB / T 3625-2007
Example 3:
TAI welding-rolled tube produced in accordance with this standard, annealed state, outer diameter 19mm, wall thickness 0.5mm, length 4000mm, marked as:
Pipe TAIWR M19x0.5X4 000 GB / T 3625-2007
3.2 Dimensions and Dimensional Tolerances
3.2.1 The allowable tolerances for the outer diameter and wall thickness of tubes shall comply with the provisions of Table 4. The allowable tolerance for the wall thickness of tubes does not apply to the hot-formed joints of welded tubes.
Table 4 Allowable tolerances for outer diameter and wall thickness
| Unit | Outer diameter (mm) | Wall thickness (mm) |
|---|---|---|
| ≤25 | ±0.25 | ±0.12 |
| 25<D≤40 | ±0.30 | ±0.15 |
| 40<D≤60 | ±0.40 | ±0.18 |
| 60<D≤80 | ±0.50 | ±0.20 |
| 80<D≤100 | ±0.60 | ±0.25 |
| 100<D≤120 | ±0.70 | ±0.30 |
| 120<D≤140 | ±0.80 | ±0.35 |
| 140<D≤160 | ±0.90 | ±0.40 |
| 160<D≤200 | ±1.00 | ±0.45 |
3.2.2 The length of the tubes shall comply with the provisions of Table 5 and Table 6.
Table 5: Length of seamless and welded-rolled tubes
| Unit | Outer diameter (mm) | Fixed length (mm) | Multiple length (mm) |
|---|---|---|---|
| ≤40 | ≤8000 | ≤6000 | ≥6000 |
| 40<D≤60 | ≤6000 | ≤4000 | ≥4000 |
| 60<D≤80 | ≤4000 | ≤3000 | ≥3000 |
| 80<D≤100 | ≤3000 | ≤2000 | ≥2000 |
| 100<D≤120 | ≤2000 | ≤1500 | ≥1500 |
| 120<D≤140 | ≤1500 | ≤1000 | ≥1000 |
| 140<D≤160 | ≤1000 | ≤800 | ≥800 |
| 160<D≤200 | ≤800 | ≤600 | ≥600 |
Table 6: Length of welded tubes
| Unit | Outer diameter (mm) | Fixed length (mm) | Multiple length (mm) |
|---|---|---|---|
| ≤40 | ≤8000 | ≤6000 | ≥6000 |
| 40<D≤60 | ≤6000 | ≤4000 | ≥4000 |
| 60<D≤80 | ≤4000 | ≤3000 | ≥3000 |
| 80<D≤100 | ≤3000 | ≤2000 | ≥2000 |
| 100<D≤120 | ≤2000 | ≤1500 | ≥1500 |
| 120<D≤140 | ≤1500 | ≤1000 | ≥1000 |
| 140<D≤160 | ≤1000 | ≤800 | ≥800 |
| 160<D≤200 | ≤800 | ≤600 | ≥600 |
3.2.3 The fixed or multiple length of the tubes shall be within their non-fixed length range. When the fixed length is <6000mm, the allowable deviation is +60mm. When the fixed length is ≥6000mm, the allowable deviation is +10mm. The multiple length shall also include the cutting amount of the tubes, and the cutting amount for each cut shall be 5mm.
3.2.4 The ends of the tubes shall be cut flat and free of burrs, and the bevel shall comply with the provisions of Table 7.
Table 7: Bevel
| Outer diameter (mm) | Angle of bevel (degrees) |
|---|---|
| ≤40 | 30-45 |
| 40<D≤60 | 25-40 |
| 60<D≤80 | 20-35 |
| 80<D≤100 | 15-30 |
| 100<D≤120 | 10-25 |
| 120<D≤140 | 5-20 |
| 140<D≤160 | 3-15 |
| 160<D≤200 | 2-10 |
3.2.5 The straightness of the tubes shall comply with the provisions of Table 8.
Table 8: Straightness
| Outer diameter (mm) | Maximum allowable deviation (mm) per meter length |
|---|---|
| ≤40 | 2 |
| 40<D≤60 | 3 |
| 60<D≤80 | 4 |
| 80<D≤100 | 5 |
| 100<D≤120 | 6 |
| 120<D≤140 | 7 |
| 140<D≤160 | 8 |
| 160<D≤200 | 9 |
3.2.6 The out-of-roundness and non-uniform wall thickness of the tubes shall not exceed the allowable tolerances for the outer diameter and wall thickness.
3.3 Chemical Composition
The chemical composition of the products shall comply with the provisions of GB/T3620.1. When the purchaser performs a re-inspection, the allowable deviation of the chemical composition shall comply with the provisions of GB/T3620.2.
3.4 Mechanical Properties
3.4.1 The room temperature mechanical properties of the tubes in the supplied state shall comply with the provisions of Table 9. The non-proportional elongation strength Rp.02 shall only be tested when required by the purchaser and specified in the contract.
Table 9: Room temperature mechanical properties
| Grade | State | Tensile strength (MPA) | Yield strength (Rp.02) (MPA) | Elongation after fracture (%) |
|---|---|---|---|---|
| TA0 | A | 300-450 | 200-350 | 20 |
| B | 300-450 | 200-350 | 20 | |
| C | 300-450 | 200-350 | 20 | |
| H | 300-450 | 200-350 | 20 | |
| TA1 | A | 400-550 | 300-400 | 25 |
| B | 400-550 | 300-400 | 25 | |
| C | 400-550 | 300-400 | 25 | |
| H | 400-550 | 300-400 | 25 | |
| TA2 | A | 500-650 | 400-500 | 20 |
| B | 500-650 | 400-500 | 20 | |
| C | 500-650 | 400-500 | 20 | |
| H | 500-650 | 400-500 | 20 | |
| TA3 | A | 450-600 | 350-450 | 22 |
| B | 450-600 | 350-450 | 22 | |
| C | 450-600 | 350-450 | 22 | |
| H | 450-600 | 350-450 | 22 | |
| TA9 | A | 500-650 | 400-500 | 20 |
| B | 500-650 | 400-500 | 20 | |
| C | 500-650 | 400-500 | 20 | |
| H | 500-650 | 400-500 | 20 | |
| TA10 | A | 550-700 | 450-550 | 18 |
| B | 550-700 | 450-550 | 18 | |
| C | 550-700 | 450-550 | 18 | |
| H | 550-700 | 450-550 | 18 |
Processing Performance
3.5 Flattening Test
3.5.1.1 The tubes shall be subjected to a flattening test. When flattened to the specified gap, there shall be no cracks on the surface of the tubes.
The distance between the flattening plates shall be calculated according to the following formula:
(1+e)H = e+UD
Where:
H–Distance between flattening plates, in millimeters (mm); t–Nominal wall thickness of tube, in millimeters (mm); D–Nominal outer diameter of tube, in millimeters (mm); e–Constant, whose value is 0.07 for TA1, TA2, TA9, and TA9-1; 0.04 for TA3 when the tube diameter is less than or equal to 25.4 mm, and 0.06 for TA3 when the tube diameter is greater than 25.4 mm; 0.04 for TA10.
3.5.1.2 When the flattening test is performed on tubes with D/t < 10, due to geometric reasons, high stress is generated at the positions equivalent to “6 o’clock” and “12 o’clock” on the inner surface of the tubes. Donc, cracks generated at these positions shall not be used as the basis for rejection.
3.5.1.3 The flattening direction and weld position of welded tubes
3.5.1.4 Flaring Test
Welded tubes and welded-rolled tubes shall be subjected to a flaring test. After flaring, there shall be no cracks at the weld of the test piece.
3.5.2 Flaring Test
The tubes shall be subjected to a flaring test. The flaring shall be carried out with a tool with a 60° cone angle. When the expansion value of the inner diameter of the test piece after flaring meets the requirements of Table 10, there shall be no cracks in the test piece.
Table 10: Flaring Test
| Grade | State | Outer diameter (mm) | Expansion value (mm) |
|---|---|---|---|
| TA0 | A, B, C, H | ≤40 | 1.5t |
| A, B, C, H | 40<D≤60 | 1.2t | |
| A, B, C, H | 60<D≤80 | 1.0t | |
| A, B, C, H | 80<D≤100 | 0.8t | |
| A, B, C, H | 100<D≤120 | 0.6t | |
| A, B, C, H | 120<D≤140 | 0.5t | |
| A, B, C, H | 140<D≤160 | 0.4t | |
| A, B, C, H | 160<D≤200 | 0.3t | |
| TA1 | A, B, C, H | ≤40 | 1.8t |
| A, B, C, H | 40<D≤60 | 1.5t | |
| A, B, C, H | 60<D≤80 | 1.3t | |
| A, B, C, H | 80<D≤100 | 1.1t | |
| A, B, C, H | 100<D≤120 | 0.9t | |
| A, B, C, H | 120<D≤140 | 0.7t | |
| A, B, C, H | 140<D≤160 | 0.6t | |
| A, B, C, H | 160<D≤200 | 0.5t | |
| TA2 | A, B, C, H | ≤40 | 2.0t |
| A, B, C, H | 40<D≤60 | 1.8t | |
| A, B, C, H | 60<D≤80 | 1.6t | |
| A, B, C, H | 80<D≤100 | 1.4t | |
| A, B, C, H | 100<D≤120 | 1.2t | |
| A, B, C, H | 120<D≤140 | 1.0t | |
| A, B, C, H | 140<D≤160 | 0.8t | |
| A, B, C, H | 160<D≤200 | 0.7t | |
| TA3 | A, B, C, H | ≤40 | 1.6t |
| A, B, C, H | 40<D≤60 | 1.4t | |
| A, B, C, H | 60<D≤80 | 1.2t | |
| A, B, C, H | 80<D≤100 | 1.0t | |
| A, B, C, H | 100<D≤120 | 0.8t | |
| A, B, C, H | 120<D≤140 | 0.7t | |
| A, B, C, H | 140<D≤160 | 0.6t | |
| A, B, C, H | 160<D≤200 | 0. |
3.5.3 Hydraulic (Pneumatic) Pressure Test
3.5.3.1 The tubes shall be subjected to a hydraulic or pneumatic pressure test. The test method chosen by the purchaser shall be specified in the contract. If not specified in the contract, the supplier shall choose the test method at its discretion.
3.5.3.2 For hydraulic tests, the test pressure chosen by the purchaser shall be specified in the contract. If not specified in the contract, the test pressure shall be calculated according to the following formula:
P = (D/2 – 0.48t)/SE
Where:
P–Test pressure, in megapascals (MPA); S–Allowable stress, take 50% of the minimum value of the specified non-proportional elongation strength, in megapascals (MPA); D–Nominal outer diameter of tube, in millimeters (mm); t–Nominal wall thickness of tube, in millimeters (mm); E–Constant, 1.0 for seamless tubes, 0.85 for welded tubes and welded-rolled tubes.
When the nominal outer diameter of the tube is not greater than 76 mm, the maximum pressure for the hydraulic test shall not be greater than 17.2 MPA; when the nominal outer diameter of the tube is greater than 76 mm, the maximum pressure for the hydraulic test shall not be greater than 19.3 MPA. The pressure shall be maintained for 5 s during the test, and the tubes shall not deform or leak.
3.5.3.3 For pneumatic tests, the internal air pressure test pressure of the tubes shall be 0.7 MPA. The pressure shall be maintained for 5 s during the test, and the tubes shall not deform or leak.
3.6 Non-Destructive Testing
Tubes with an outer diameter of 10 mm to 60 mm shall be subjected to ultrasonic or eddy current testing, and shall comply with the provisions of GB/T12969. The testing method chosen by the purchaser shall be specified in the contract. If not specified in the contract, the supplier shall determine one method for testing at its discretion. For other specifications of tubes, ultrasonic or eddy current testing shall be carried out at the discretion of both parties.
3.7 Appearance Quality
3.7.1 The inner and outer surfaces of the tubes shall be clean and free of visible defects such as cracks, folds, peeling, and pinholes. The welds of welded tubes shall be fully filled and smoothly transitioned.
3.7.2 Local defects on the surface of the tubes may be removed, but the removal shall not cause the outer diameter and wall thickness to exceed their allowable tolerances.
3.7.3 The surface of the tubes may have scratches, dents, bumps, and straightening marks that do not exceed the allowable tolerances for outer diameter and wall thickness. Different colors are allowed on the surface of the tubes after pickling.
4.1 Referee Analysis Method for Chemical Composition
The referee analysis of the chemical composition of the tubes shall be carried out in accordance with GB/T4698.
4.2 Mechanical Properties Test Methods
4.2.1 The room temperature tensile test method for tubes shall be carried out in accordance with GB/T228.
4.2.2 For tubes with an outer diameter not greater than 35 mm, the S8 test piece in GB/T228 shall be used; for tubes with an outer diameter greater than 35 mm, the S4 test piece shall be used.
4.3 Processing Performance Test Methods
4.3.1 The hydraulic test for tubes shall be carried out in accordance with GB/T241.
4.3.2 The pneumatic pressure test for tubes shall be carried out in accordance with a method agreed upon by the purchaser and the supplier.
4.3.3 The flaring test for tubes shall be carried out in accordance with GB/T242.
4.3.4 The flattening test for tubes shall be carried out in accordance with GB/T246.
4.4 Non-Destructive Testing Methods
For tubes with dimensions within the scope of GB/T12969, ultrasonic and eddy current testing shall be carried out in accordance with GB/T12969. For tubes with dimensions beyond the scope of GB/T12969, manual ultrasonic testing methods may be used.
4.5 Dimensional Measurement Methods
The dimensional inspection of tubes shall be carried out with measuring instruments of appropriate accuracy.
4.6 Appearance Quality Inspection Method
The appearance quality inspection of tubes shall be carried out by visual inspection.
5.1 Inspection and Acceptance
5.1.1 The products shall be inspected by the supplier’s quality inspection department to ensure that the product quality meets the requirements of this standard or the contract, and a quality certificate shall be filled out.
5.1.2 The purchaser shall accept the products received in accordance with the provisions of this standard. If the inspection results do not conform to the provisions of this standard, the purchaser shall raise an objection to the supplier within three months from the date of receipt of the products, and the two parties shall negotiate a solution. If arbitration is required, the sampling for arbitration shall be jointly carried out by the purchaser and the supplier.
5.2 Groups and Batches
Products shall be submitted for acceptance in batches, and each batch shall consist of products of the same grade, heat number, specification, manufacturing method, state, and from the same heat treatment furnace.
5.3 Inspection Items
Each batch of products shall be subjected to inspection of chemical composition, dimensional tolerance, mechanical properties, processing performance, non-destructive testing, and appearance quality. The inspection items specified in the contract shall also be subjected to inspection.
5.4 Sampling Location and Sampling Quantity
The sampling of products shall comply with the provisions of Table 11.
Table 11 Sampling Location and Sampling Quantity
| Item | Sampling Location | Sampling Quantity |
|---|---|---|
| Chemical composition | From each batch, take a sample from each heat treatment furnace batch and analyze one sample for each element. | 1 |
| Dimensional deviation | From each batch, take 1% of the products for inspection, but not less than 2 pieces. | As needed |
| Mechanical properties | From each batch, take 1% of the products for inspection, but not less than 2 pieces. | As needed |
| Processing performance | From each batch, take 1% of the products for inspection, but not less than 2 pieces. | As needed |
| Non-destructive testing | From each batch, take 100% of the products for inspection. | As needed |
| Appearance quality | From each batch, take 100% of the products for inspection. | As needed |
5.5 Retesting and Judgment of Inspection Results
5.5.1 If the chemical composition is not qualified, the batch shall be judged as unqualified.
5.5.2 In the room temperature mechanical properties test, flattening test, and flaring test, if the test result of one test piece is not qualified, then double test pieces shall be taken from the batch to repeat the test for the unqualified items. If the test result of the repeat test is still unqualified for one test piece, then the batch of products shall be judged as unqualified. Cependant, the supplier may inspect each product individually for the unqualified items, and those that are qualified shall be regrouped.
5.5.3 If the dimensions and shape, surface quality, hydraulic test, and ultrasonic test of the tubes are not qualified, the single tube shall be judged as unqualified.
6 Marking, Packaging, Transportation and Storage
6.1 Marking
The following marks shall be made on the inspected and packaged tubes and cartons:
a) Product grade; b) Product name; c) Supply status; d) Batch number; e) This standard number.
6.2 Packaging, Transport and Storage
The packaging, transport and storage of products shall comply with the relevant provisions of GB/T8180.
6.3 Quality Certificate
A quality certificate shall be attached to each batch of tubes, indicating:
a) Name of the supplier; b) Product name; c) Product grade, specification, manufacturing method and state; d) Heat number, batch number, batch weight and number of pieces; e) Analysis and inspection results and quality inspection department seal; f) This standard number; g) Packing date.
7 Content of Order Form (or Contract)
The order form (or contract) for ordering the materials listed in this standard shall include the following contents:
a) Product name; b) Grade; c) State; d) Dimensional specifications; e) Weight or number of pieces; f) Working pressure for hydraulic test; g) Ultrasonic or eddy current testing; h) This standard number; i) Others.