Views: 2 Author: Site Editor Publish Time: 2025-10-15 Origin: Site
When receiving a repurchase request from a Vietnamese old customer, the salesperson promptly grasped the customer's demand: this batch of ASME B16.11 forged threaded coupling is a supplementary procurement for a project under construction, and they are reducing coupling with very urgent delivery requirements. And it also includes two materials: ASTM A105 carbon steel and SS304 stainless steel. ASME B16.11 reducing threaded coupling are basically out of stock, so it is necessary to urgently allocate raw materials for production. Considering the trust foundation of the customer's past cooperation and the potential losses caused by project suspension, our company has decided to immediately arrange production for the customer. By the time the customer's payment is received, the product will have been basically completed.
Item | Description of Goods | Qty | Unit |
9 | REDUCER 2"=>1 1/2"x86L,A105,THREAD,ASME B16.11, FEMALE BSPT TYPE, CLASS 3000 | 20 | PCS |
10 | REDUCER ,2"=>1 1/2"x86L,SS304.THREAD,ASME B16.11,FEMALE BSPT TYPE, CLASS 3000 | 10 | PCS |
11 | REDUCER ,2 1/2"=>2"x92L,A105,THREAD,ASME B16.11,FEMALE BSPT TYPE, CLASS 3000 | 20 | PCS |
12 | REDUCER ,2 1/2"=>2"x92L.SS304,THREAD,ASME B16.11.FEMALE BSPT TYPE , CLASS 3000 | 10 | PCS |
13 | REDUCER ,2 1/2"=>1 1/2"x92L,A105,THREAD, | 20 | PCS |
14 | REDUCER ,2 1/2"=>1 1/2"x92L.SS304,THREAD, | 10 | PCS |
Finally, with the collaboration of various departments, the production, inspection, and packaging of this batch of ASME B16.11 reducing coupling were completed 2 days ahead of schedule. The logistics team prioritized customs clearance and transportation to ensure that the goods were delivered to the Vietnam project site on time. After receiving the goods, the customer sent feedback stating that this batch of coupling timely filled the material gap in the project, avoiding delays in the construction period. They highly recognized our ability to respond to urgent orders and product quality, and expressed their intention for long-term cooperation in the future.
In industrial pipeline systems, reliable connecting components are key to ensuring stable system operation, and ASME B16.11 forged threaded coupling is among the best. It is widely used in many fields such as petroleum, chemical, and power due to its strict standard specifications, diverse type selection, and excellent performance.
The ASME B16.11 standard is an important specification in the field of forged pipe fittings, developed by the American Society of Mechanical Engineers, providing a unified and strict standard for the production, design, inspection, and other aspects of forged threaded coupling. This standard has clear requirements for the dimensional accuracy, material properties, forging process, thread accuracy, and pressure rating of coupling, ensuring the consistency and reliability of product quality. Forged threaded coupling that comply with ASME B16.11 standard can withstand high pressure under different working conditions, effectively reducing the risk of leakage and building a solid defense line for the safe operation of pipeline systems.
From the appearance, ASME B16.11 forged threaded coupling are mainly divided into single head and double head threaded coupling.
Threaded half coupling has threads, and the other end is for other connection forms or used for sealing under specific working conditions. It is commonly used for connecting the end of the pipeline or in situations where temporary sealing is required. It is easy to install and can quickly achieve local connection and sealing of the pipeline.
Core feature: Threads are only machined on the inner or outer wall of one end of the pipe clamp, and the other end is a smooth pipe mouth (without threads on the inner wall) or a welding groove; The overall structure is simple, the processing technology is relatively simple, and the cost is lower; During installation, only the threaded end needs to be sealed, with fewer operating steps.
Main purpose: Used for the "end connection" of pipeline systems, such as the transition between pipelines and equipment interfaces. Smooth ends can be fixed to equipment flanges or pipe openings through welding, while threaded ends can be connected to pipelines to achieve a composite connection of "welding+threading", balancing sealing and disassembly convenience; Suitable for local pipelines that require frequent maintenance, such as instrument interfaces and short pipe connections before and after valves. The threaded end is easy to disassemble and maintain quickly, while the smooth end is fixed to the main pipeline through welding, reducing damage to the main pipeline.
Threaded full coupling have threads on both ends and can be used to connect two pipes of the same specification, enabling quick docking of pipes. They have obvious advantages in situations where frequent disassembly or adjustment of pipe length is required. Their symmetrical structural design also ensures the stability and uniformity of the connection.
Core features: The inner walls of both ends of the pipe clamp are threaded, and the thread specifications can be the same or different; Both ends have consistent thread accuracy and can be used to connect pipelines in both directions; Pipeline docking can be completed without welding, with high installation efficiency; By adjusting the depth of thread engagement and fine-tuning the length of the pipeline, it is possible to adapt to on-site installation errors.
Main application: When the thread specifications at both ends are the same, it is used for "straight connection" of two pipes with the same diameter, such as extending straight pipe sections and connecting broken pipes during pipeline maintenance. It is widely used for connecting straight pipe sections in oil and gas transportation; When the thread specifications of the two ends are different (i.e. reducing double head threaded coupling), it is used for "variable diameter connection" of pipes with different diameters, such as transitioning from DN50 pipes to DN40 pipes, without the need for additional variable diameter joints, and can be smoothly transitioned directly through coupling. It is commonly used in the connection of different process pipelines in chemical plants.
Joint Type | Class | Grade of Connecting Pipes |
THRD | 2000 | Sch80/XS |
3000 | Sch160 | |
6000 | XXS |
The thread form is a key factor affecting the connection performance of threaded coupling. The common thread forms of ASME B16.11 threaded coupling mainly include NPT, BSP, and PT.
NPT thread (American standard taper pipe thread): This is a commonly used taper pipe thread with a thread profile of 60 ° and self sealing characteristics. Due to the conical shape of the thread, the tooth sides of the internal and external threads are tightly fitted during the connection process, and a certain sealing effect can be achieved without the need for additional sealing components, making it suitable for medium and low pressure pipeline systems. NPT threads are divided into NPT external threads and NPT internal threads. During installation, attention should be paid to the length and torque control of the threads to ensure sealing performance and connection strength.
BSP thread (British Standard Cone Pipe Thread): BSP is the overall code for British pipe threads, but it is divided into three types: BSPP, BSPT, and BSPF.
BSPP is the code for British cylindrical pipe threads, with only internal threads, equivalent to 55 degree cylindrical (parallel) pipe threads in China;
BSPT: It is a British conical pipe thread standard, which refers to a thread profile angle of 55 degrees and a taper of 1:16,
BSPF: for British fine tooth pipe threads; The first two are used for sealing joints, while the latter one is used for general joints.
Compared with NPT threads, BSPT threads have different pitch and size specifications, and are mainly widely used in Europe and Commonwealth countries. When selecting, it is necessary to determine the appropriate thread form based on the design standards of the pipeline system and the region of use, to ensure compatibility and reliability of the connection.
PT Thread: It is a 55 degree sealed conical pipe thread, belonging to the Wyeth thread family, commonly used in Europe and federal countries, commonly used in the water and gas pipe industry, with a taper of 1:16. The marking of pipe threads consists of thread characteristic code (R) and size code. R1/2 represents an R thread with a thread size of 1/2.
ASTM A105 carbon steel forged fittings have good strength and toughness, relatively low cost, and are suitable for general industrial pipelines at room temperature and pressure, such as water supply and drainage pipelines, steam pipelines, etc. They are widely used in ordinary transportation pipelines in the petrochemical industry.
ASTM A105 is a standard developed by the American Society for Testing and Materials, mainly applicable to carbon steel forged fittings under high temperature and high pressure environments, including threaded coupling, elbows, tees, etc. This standard specifies the performance requirements that ASTM A105 threaded coupling must meet in high temperature and high pressure environments, covering the entire process from raw material procurement to finished product inspection. The specification scope is broad and targeted, providing important guarantees for the safe operation of pipeline systems.
ASTM A105 material has excellent comprehensive performance. In terms of mechanical properties, its tensile strength is not less than 485MPa, yield strength is not less than 250MPa, elongation is over 20%, it has good toughness and tensile resistance, and can effectively withstand pressure and external impact during pipeline system operation. In terms of corrosion resistance, this material has good corrosion resistance to neutral aqueous solutions, steam and other media at room and medium temperatures, which can reduce the risk of pipeline fittings being damaged due to corrosion and extend their service life. In addition, it also has excellent malleability and machinability, making it easy to manufacture various complex shaped pipeline fittings to meet different pipeline connection needs.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
| ASTM A105 | MIN | 0.60 | 0.10 | ||||||||
| MAX | 0.35 | 1.05 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % | HARDNESS |
| ASTM A105 | 485 min | 250 min | 22 min | 30 min | 197 max |
ASTM A182 stainless steel forged fittings have excellent corrosion resistance and can resist the erosion of various acidic and alkaline media. They are suitable for highly corrosive working conditions, such as acid and alkali transport pipelines in chemical production and seawater treatment pipelines in marine engineering.
The commonly used materials for stainless steel threaded coupling include ASTM A182 F304/F316/F44; Stainless steel grades such as duplex stainless steel F51/F53 have excellent corrosion resistance and high temperature performance, which can meet the needs of different working conditions.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
| ASTM A182 F304 | MIN | 8.0 | 18.0 | ||||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | 0.10 | |||
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | |||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.01 | ||
| ASTM A182 F44 | MIN | 17.50 | 19.50 | 6.00 | 0.50 | ||||||
| MAX | 0.02 | 1.00 | 0.030 | 0.010 | 0.80 | 18.50 | 20.50 | 6.50 | 1.00 | ||
| ASTM A182 F51 | MIN | 4.50 | 21.00 | 2.50 | 0.08 | ||||||
| MAX | 0.03 | 2.00 | 0.030 | 0.020 | 1.00 | 6.50 | 23.00 | 3.50 | 0.20 | ||
| ASTM A182 F53 | MIN | 6.00 | 24.00 | 3.00 | 0.24 | ||||||
| MAX | 0.03 | 1.20 | 0.035 | 0.020 | 0.80 | 8.00 | 26.00 | 5.00 | 0.32 | 0.5 |
Mechanical Properties
| MATERIAL | ASTM A182 F304 | ASTM A182 F316 | ASTM A182 F44 | ASTM A182 F51 | ASTM A182 F53 |
| T.S (MPA) | 515 min | 515 min | 650 min | 620 min | 800 min |
| Y.S (MPA) | 205 min | 205 min | 300 min | 450 min | 550 min |
| EL % | 30 min | 30 min | 35 min | 35 min | 25 min |
| R/A % | 50 min | 50 min | 50 min | 45 min | 15 min |
| HARDNESS | 310 max |
Petrochemical Industry
Power Industry
Municipal Engineering
Ocean Engineering
ASME B16.11 forged threaded pipe clamps have become an ideal choice for industrial pipeline connections due to their strict standards, diverse types, and excellent performance, providing solid support for production and operation in various industries.
