SCH 80 carbon steel fittings

What are carbon steel fittings?

Carbon steel fittings are the most widely used pipe fitting products, made of carbon steel. The main products include carbon steel elbows, carbon steel flanges, carbon steel tees, carbon steel crosses, carbon steel reducers (large and small heads), carbon steel heads (pipe caps), etc. The main implementation standards include national standards, American standards, Japanese standards, etc. The Chinese standards include the standards of the Ministry of Chemical Industry, Sinopec pipe fittings standards, and power pipe fittings standards. The main materials are: Q235, 20#, 35#, 45#, 16Mn, etc. Commonly used American carbon steel standards are: ASTM A234 WPB, ASTM A234 WPC.

What is SCH 80?
SCH 80 (Schedule 80 pipe) represents the wall thickness, which refers to XS thickened pipes with a pressure wall thickness less than DN200mm. Usage scenarios generally involve high temperature, high pressure, and highly corrosive conditions. The wall thickness of SCH 80 grade pipes is relatively thick, and the pressure and temperature in the use environment must comply with ASME/ANSI standards to ensure the safety and reliability of the pipeline system. SCH 80 grade piping systems are often used in the manufacture of chemical equipment, high-pressure pipelines, high-temperature heaters and some special piping systems. When designing and installing a steel pipe system, it is necessary to select the appropriate pipe number according to the actual use environment to ensure the stability and safety of the pipeline system.

Manufacturing process of SCH 80 carbon steel fittings:

1. Material cutting: Cut according to the required length, size and angle;
2. Blank heating: Improves the plasticity and processability of pipe fittings and removes internal stress;
3. Forging: The heated billet is processed on a forging machine, and it is forged into a predetermined shape by repeated hammering, extrusion, and stretching;
4. Adjust the size: The forged pipe fittings need to be adjusted in size before the next step of processing;
5. Pickling treatment: Remove surface oxides and make the surface smoother;
6. Heat treatment: Anneal or normalize the pipe fittings to enhance their strength and durability;
7. Processing: Perform hole processing, thread processing, etc. on pipe fittings.

Standard specification for SCH 80 carbon steel fittings:

The standard specification for SCH 80 carbon steel pipe fittings is an important guarantee for ensuring the safety and quality of pipeline system operations. Various standard-setting organizations at home and abroad have formulated corresponding standards, such as the international pipe fitting standard ASME B16.9, the domestic steel pipe fitting standard GB/T12459, etc. There are corresponding regulations on the specifications, dimensions, surface treatment, pipe wall thickness, etc. of pipe fittings.

The internationally accepted pipe flange standards can be summarized into two different and non-interchangeable pipe flange systems: one is the European pipe flange system represented by Germany; the other is the American pipe flange system represented by the United States. system.

Quality control of carbon steel fittings:

Quality control of carbon steel fittings is the key to ensuring the quality and safety of the pipeline system. The quality inspection of pipe fittings includes appearance quality inspection, chemical composition analysis, physical performance testing, non-destructive testing and other aspects. Only pipe fittings that have passed the inspection can be put into use to ensure the safe and effective operation of the pipeline system.

Advantages and disadvantages of carbon steel fittings:

Advantages of carbon steel fittings:
1. Good mechanical properties: Carbon steel has good tensile strength, flexural strength and hardness, and is more suitable for manufacturing mechanical components and parts.
2. Relatively low price: Compared with stainless steel, copper, aluminum and other materials, carbon steel is relatively cheap and has a relatively low cost.
3. Easy to process: Carbon steel has good processing performance and is easy to drill, mill, turn, cut, etc., and can meet the needs of various processing techniques.

Disadvantages of carbon steel fittings:
1. Easy to rust: Carbon steel pipes are prone to rust in humid environments, affecting their service life and beautiful appearance.
2. Poor corrosion resistance: Carbon steel pipes have poor corrosion resistance and are highly corrosive to chemicals, water and other corrosive substances, and require regular anti-corrosion treatment.
3. Local defects are easy to occur: During the production and use of carbon steel pipes, local defects are easy to occur due to various reasons, which will affect the strength and service life of the pipe.

SCH 40 pipe vs SCH 80 carbon steel fittings:
The main difference between SCH 40 and SCH 80 carbon steel fittings is the wall thickness. SCH 40 pipe has a thinner wall thickness and is often used in low-pressure applications such as residential plumbing or irrigation systems. SCH 80 carbon steel fitting has thicker walls and is used in high-pressure applications such as industrial processes, hydraulic systems and underground piping. They are designed to handle higher pressures and withstand greater stresses than SCH 40 pipe.

Looking at specific dimensions, the wall thickness of SCH 40 pipe is approximately 0.109 inches, while the wall thickness of SCH 80 pipe is approximately 0.154 inches. This means that SCH 80 pipe is approximately 30% thicker than SCH 40 pipe. While SCH 80 pipe is stronger and more durable than SCH 40 pipe, they are also more expensive.

SCH 80 pipe has thicker walls and requires more material and more manufacturing time, which increases costs. When selecting pipe for a specific application, it is important to consider the pressure requirements and the cost-effectiveness of selecting thicker, more expensive pipe.

Pipe Sch 80 Chart, Dimensions, Weight And Pipe Wall Thickness

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.095	2.41	0.31	0.47
1/4	0.54	13.7	0.119	3.02	0.54	0.8
1/2	0.84	21.3	0.147	3.73	1.09	1.62
3/4	1.05	26.7	0.154	3.91	1.47	2.2
1	1.315	33.4	0.179	4.55	2.17	3.24
1 1/4	1.66	42.2	0.191	4.85	3	4.47
1 1/2	1.9	48.3	0.2	5.08	3.63	5.41
2	2.375	60.3	0.218	5.54	5.02	7.48
2 1/2	2.875	73	0.276	7.01	7.66	11.41
3	3.5	88.9	0.3	7.62	10.25	15.27
3 1/2	4	101.6	0.318	8.08	12.5	18.63
4	4.5	114.3	0.337	8.56	14.98	22.32
5	5.563	141.3	0.375	9.53	20.78	30.97
6	6.625	168.3	0.432	10.97	28.57	42.56
8	8.625	219.1	0.5	12.7	43.39	64.64
10	10.75	273	0.594	15.09	64.43	96.01
12	12.75	323.8	0.688	17.48	88.63	132.08
14	14	355.6	0.75	19.05	106.13	158.1
16	16	406.4	0.844	21.44	136.61	203.53
18	18	457	0.938	23.83	170.92	254.55
20	20	508	1.031	26.19	208.87	311.17
24	24	610	1.125	30.96	296.58	442.08

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