ASTM A333 Grade 7 Low-Temperature Seamless Steel Pipe
- ASTM A333/ASME SA333
- China
- Stock,Production
- Grade 7
ASTM A333 Grade 7 is a grade of ASTM A333.ASTM A333/A333M-16 Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness.
ASTM A333 Grade 7 Low-Temperature Seamless Steel Pipe
ASTM A333 Grade 7 Low-Temperature Seamless and Welded Steel Pipe
ASTM A333 Grade 7 is a grade of ASTM A333.ASTM A333/A333M-16 Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness.
ASTM A333 Grade 7 Steel Pipe is suitable for -45 ~ -195 ~ C low temperature pressure vessel pipes and seamless steel tubes for low temperature heat exchanger pipes.
ASTM A333 Grade 7 Low-Temperature Seamless Steel Pipe Quick Details
Company Name: beite steel pipe
Country/Region: China
Product Name：ASTM A333 Grade 7 Steel Pipe
FOB Price: US $1300-2600 / Ton | 1 Ton/Tons (Min. Order)
Port of Shipment：Tianjin,China
Payment：L/C or T/T
Delivery: 7-15 days after payment
Package：Standard export package,suit for all kinds of transport, or as required.
ASTM A333 Grade 7 Low-Temperature Seamless Steel Pipe Dimensional Range & Specification
Outside Diameter：20 – 215mm
Wall thickness：2mm——15mm
Length：6000mm、12000m or specified length as required.
Materials and Manufacture
Manufacture—The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
Heat Treatment:
Normalize by heating to a uniform temperature of not less than 1500°F [815°C] and cool in air or in the cooling chamber of an atmosphere controlled furnace.reheat to a suitable tempering temperature.
For the seamless process only, reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750°F [845 to 945°C] and cool in air or in a controlled atmosphere furnace from an initial temperature of not less than 1550°F [845°C].reheat to a suitable tempering temperature.
Chemical Composition(%) & Physical Properties of ASTM A333 Grade 7 Steel Pipe
ASTM A333 Grade 7 Steel Pipe Chemical Composition(%)
| Steel Grade | Chemical Composition(%) | ||||||||||||
| C | Mn | P | S | Si | Ni | ||||||||
| Grade 7 | ≤0.19 | ≤0.90 | ≤0.025 | ≤0.025 | 0.13-0.32 | 2.03-2.57 | |||||||
Mechanical Properties
Tensile Requirements
| Grade 7 | ||
| Ksi | Mpa | |
| Tensile strength, min | 60 | 415 |
| Yield strength, min | 35 | 240 |
| Longitudinal | Transverse | |
| Elongation in 2 in.or 50 mm, (or 4D), min, %: | ||
|
Basic minimum elongation for walls 5⁄16 in.[8 mm]and over in thickness,strip tests, and for all small sizes tested in full section |
30 | 22 |
| When standard round 2-in.or 50-mm gage length or proportionally smaller size test specimen with the gage length equal to 4D (4 times the diameter) is used | 22 | 14 |
| For strip tests,a deduction for each 1⁄32 in.[0.8 mm] decrease in wall thickness below 5⁄16 in.[8 mm] from the basic minimum elongation of the following percentage | 1.50B | 1.00B |
| Wall Thickness | Elongation in 2 in. or 50 mm, min, %C | ||
| Grade 7 | |||
| in. | mm |
Longi- tudinal |
Trans- verse |
| 5⁄16 (0.312) | 8 | 30 | 22 |
| 9⁄32 (0.281) | 7.2 | 28 | 21 |
| 1⁄4 (0.250) | 6.4 | 27 | 20 |
| 7⁄32 (0.219) | 5.6 | 26 | .... |
| 3⁄16 (0.188) | 4.8 | 24 | .... |
| 5⁄32 (0.156) | 4 | 22 | .... |
| 1⁄8 (0.125) | 3.2 | 21 | .... |
| 3⁄32 (0.094) | 2.4 | 20 | .... |
| 1⁄16 (0.062) | 1.6 | 18 | .... |
B The following table gives the calculated minimum values.
C Calculated elongation requirements shall be rounded to the nearest whole number.
Note:The preceding table gives the computed minimum elongation values for each 1⁄32in. [0.80mm] decrease in wall thickness. Where the wall thickness lies between two values shown above, the minimum elongation value is determined by the following equation:
| Grade | Direction of Test | Equation |
| 7 | Longitudinal | E = 48t + 15.00 [E = 1.87t + 15.00] |
| Transverse | E = 32t + 11.00 [E = 1.25t + 11.00] | |
|
where: E = elongation in 2 in. or 50 mm, in %, and t = actual thickness of specimen, in. [mm]. |
||
Workmanship, Finish and Appearance
1.The pipe manufacturer shall explore a sufficient num- ber of visual surface imperfections to provide reasonable assurance that they have been properly evaluated with respect to depth.
2.Surface imperfections that penetrate more than 12½ % of the nominal wall thickness or encroach on the minimum wall thickness shall be considered defects.
2.Surface imperfections that penetrate more than 12½ % of the nominal wall thickness or encroach on the minimum wall thickness shall be considered defects.
3.The pipe manufacturer shall remove by grinding the following:
Mechanical marks, abrasions and pits, any of which imperfections are deeper than 1⁄16 in. [1.6 mm], and
Visual imperfections commonly referred to as scabs, seams, laps, tears, or slivers found by exploration
4.When imperfections or defects are removed by grind- ing, a smooth curved surface shall be maintained, and the wall thickness shall not be decreased below that permitted by this specification. The outside diameter at the point of grinding may be reduced by the amount so removed.
5.The finished pipe shall be reasonably straight.
4.When imperfections or defects are removed by grind- ing, a smooth curved surface shall be maintained, and the wall thickness shall not be decreased below that permitted by this specification. The outside diameter at the point of grinding may be reduced by the amount so removed.
5.The finished pipe shall be reasonably straight.
Mechanical Testing
Sampling—For mechanical testing
1.Transverse or Longitudinal Tensile Test and Flattening Test
2..Hydrostatic Test—Each length of pipe shall be sub- jected to the hydrostatic test.
3.Impact Test
Impact Tests (Welded Pipe)
Impact Test
Except when the size of the finished pipe is insufficient to permit obtaining subsize impact specimens, all material furnished to this specification and marked in accordance with Section 16 shall be tested for impact resistance at the minimum temperature for the respective grades
| Steel Grade | Impact temperature | ||||||||||||
| ℉ | ℃ | ||||||||||||
| Grade 7 | -100 | -75 | |||||||||||
Hydrostatic or Nondestructive Electric Test
Product Marking
Except as modified in 16.1.1, in addition to the marking prescribed in Specification A 999/A 999M, the mark- ing shall include whether hot finished, cold drawn, seamless or welded, the schedule number and the letters “LT” followed by the temperature at which the impact tests were made, except when a lower test temperature is required because of reduced specimen size, in which case, the higher impact test tempera- ture applicable to a full-size specimen should be marked.
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