ASTM A135-Grade A/B Steel Pipe
TUSPIPE offers resistance-welded spray pipes certified to ASTM A135 standards, including ASTM A135 grade A and ASTM A135 grade B, in a wide range of sizes. Please see the ASTM A135 size chart below.
ASTM A135
ASTM A135 is an American Society for Testing and Materials (ASTM) standard of ERW steel pipe for conveying gas, vapor, water, or other liquid, it is also commonly used in fire-protection applications.
ASTM A135 steel pipe is a common type of pipe material that is used in a variety of applications. The weld seam of ERW pipe to Grade B pipe shall be heat treated after welding or processed in such a manner that no untempered martensite remains. Tensile and chemical requirements of the steel are provided.
Technique: ERW Steel Pipe
Process: flat-rolled steel one by one in individual lengths or continuous lengths by resistance weldingor induction welding
A135 Gr.a: NPS: 2 to 30/ 벽 두께: Up to 12.7mm
A135 Gr.b: NPS: 3/4 to 5/ 벽 두께: Up to 12.7mm
Test：Flattening Tests、Hydrostatic Tests、Nondestructive Electric test、Either Electromagnetic (Eddy Current) or Ultrasonic Test
Steel Grades of ASTM A135 Sprinkler Pipes(GRADE A& GRADE B)
ASTM A135 is an important standard for electric-resistance-welded steel pipe. The standard covers two grades of pipe (Grade A & Grade B) that are intended for conveying gas, vapor, water, or other liquid. The most important aspect of the standard is the requirement that the weld seam of Grade B pipe be heat treated after welding or processed in such a manner that no untempered martensite remains.
This requirement is critical to ensuring the strength and durability of the pipe. ASTM A135 is just one of many standards that companies must adhere to in order to produce high-quality pipes that will meet the needs of their customers.
ASTM A135 Grade A
The chemical and mechanical properties of ASTM A135 Grade A pipes make them ideal for use in high-pressure applications, such as conveying gas, vapor, water, or other fluid. In some countries, ASTM A135 Grade A pipes are also used as fire sprinkler pipes.
ASTM A135 Grade B
The steel grade ASTM A135 Grade B is utilized for Electric-Resistance-Welded (ERW) steel pipes for conveying gas, vapor, water, or other liquid, it is also commonly used in fire-fighting applications. Grade A pipe is the standard grade, while, Grade B pipe is the higher-strength alternative.
Dimensions and Sizes of ASTM A135 Sprinkler Pipes
ASTM A135 표준 파이프 치수의 포괄적인 목록은 ASME B36.10M에 포함되어 있습니다. ASTM A135는 전기 저항 용접 강관에 대한 표준 사양입니다.
It covers two grades of ERW steel pipe in sizes NPS 2 to 30, with nominal (average) wall thickness up to 12.7mm, inclusive, and in 공칭 크기 NPS 3/4 ~ 5 공칭(평균) wall thickness of 2.11mm to 3.40mm, depending on size.
이 사양은 플랜지, 굽힘 및 기타 유사한 성형 작업과 용접에 적합한 전기 저항 용접 파이프에 적용됩니다. 용접의 전기 저항은 아크 길이를 단면적으로 나누어 계산합니다.
| N.D. | O.D. | SCH 10 | SCH 30/40 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| WALL THICKNESS | NOMINAL WEIGHT | WALL THICKNESS | NOMINAL WEIGHT | ||||||||
| (mm) | (Inch) | (mm) | (Inch) | (mm) | (Inch) | (kg/mtrs) | (lbs/ft) | (mm) | (Inch) | (kg/mtrs) | (lbs/ft) |
| 15 | 1/2 | 21.3 | 0.84 | —- | —- | —- | —- | 2.77 | 0.109 | 1.27 | 0.85 |
| 20 | 3/4 | 26.7 | 1.05 | 2.11 | 0.083 | 1.28 | 0.96 | 2.87 | 0.113 | 1.69 | 1.13 |
| 25 | 1 | 33.4 | 1.32 | 2.77 | 0.109 | 2.09 | 1.41 | 3.38 | 0.133 | 2.5 | 1.68 |
| 32 | 1-1/4 | 42.2 | 1.66 | 2.77 | 0.109 | 2.69 | 1.81 | 3.56 | 0.14 | 3.39 | 2.27 |
| 40 | 1-1/2 | 48.3 | 1.9 | 2.77 | 0.109 | 3.11 | 2.09 | 3.68 | 0.145 | 4.05 | 2.72 |
| 50 | 2 | 60.3 | 2.38 | 2.77 | 0.109 | 3.93 | 2.64 | 3.91 | 0.154 | 5.45 | 3.66 |
| 65 | 2-1/2 | 73 | 2.88 | 3.05 | 0.12 | 5.26 | 3.53 | 5.16 | 0.203 | 8.64 | 5.8 |
| 80 | 3 | 88.9 | 3.5 | 3.05 | 0.12 | 6.46 | 4.34 | 5.49 | 0.216 | 11.29 | 7.58 |
| 90 | 3-1/2 | 101.6 | 4 | 3.05 | 0.12 | 7.41 | 4.98 | 5.74 | 0.226 | 13.58 | 9.12 |
| 100 | 4 | 114.3 | 4.5 | 3.05 | 0.12 | 8.37 | 5.62 | 6.02 | 0.237 | 16.09 | 10.8 |
| 125 | 5 | 141.3 | 5.56 | 3.4 | 0.134 | 11.58 | 7.78 | 6.55 | 0.258 | 21.79 | 14.63 |
| 150 | 6 | 168.3 | 6.63 | 3.4 | 0.134 | 13.85 | 9.3 | 7.11 | 0.28 | 28.29 | 18.99 |
| 200 | 8 | 219.1 | 8.63 | 4.78 | 0.188 | 25.26 | 16.96 | 7.04 | 0.277 | 36.82 | 24.72 |
| 250 | 10 | 273.1 | 10.75 | 4.78 | 0.188 | 31.62 | 21.23 | 7.08 | 0.307 | 51.05 | 34.27 |
Chemical Composition of ASTM A135 Pipe
| Steel Grades | Carbon max | 망간 | 인 | 유황 |
|---|---|---|---|---|
| ASTM A135 Gr.A | 0.25% | 0.95% | 0.035% | 0.035% |
| ASTM A135 Gr.B | 0.3% | 1.2% | 0.035% | 0.035% |
Mechanical Properties of ASTM A135 Pipes
| ASTM A135 | ASTM A135 Grade A | ASTM A135 Grade B |
|---|---|---|
| 인장 강도, | 48 | 60 |
| 최소, ksi [MPa] | [330] | [415] |
| 수율 강도, | 30 | 35 |
| 최소, ksi [MPa] | [205] | [240] |
| 신장, | 35 | 30 |
| 분, % |
Sample longitudinal bar experiment：For pipe having a specified wall thickness of less than5 ⁄16 in. (7.9 mm), if tested using a longitudinal strip test specimen
ASTM A135 gr a :The minimum elongation shall be determined by the following equation, with the calculated value rounded to the nearest percent:
E = 56t+16.5
[E = 2.2t=16.5]
where:
E = elongation in 2 in. or [50 mm], minimum, %, and
t = specified wall thickness, in. [mm].
ASTM A135 gr b: The minimum elongation shall be determined by the following equation, with the calculated value rounded to the nearest percent:
E = 48t+14
[E = 1.9t+14]
where:
E = elongation in 2 in. or [50 mm], minimum, %, and
t = specified wall thickness, in. [mm].
The Purpose of Painting ASTM A135 Fire Pipes in Red
One of the most important parts of a fire safety system is the fire sprinkler. Fire sprinklers are designed to provide water to suppress or extinguish a fire. They are usually located on the roof or the top floors of a building, and the pipes that carry the water are typically painted red so that they are easily visible in the event of a fire. Fire sprinklers are usually activated by heat, and the water is discharged through sprinkler heads that are located throughout the building. In most cases, only the sprinklers closest to the fire will activate, which minimizes water damage. Fire sprinklers are an essential part of any fire safety system, and their use can help to save lives and property.
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