Forged tees (equal diameter/different diameter) · Material: P91 (A335 P91)
1. Product Overview
This product is made of high-quality P91 steel (corresponding standard: A335 P91) and processed through precision forging technology. P91 is a high-strength chromium-molybdenum alloy steel, renowned for its excellent creep strength and oxidation resistance at high temperatures. This forged three-way fitting is specially designed for harsh working conditions with high parameters, high temperature and high pressure, ensuring the safety, stability and long service life of the pipeline system under extreme conditions. Compared with casting or pushing three-way fittings, forging process brings higher mechanical strength and a denser and more uniform internal structure.
2. Core Features and Advantages
Outstanding high-temperature performance: It can maintain high strength at a continuous working temperature of up to 600°C, with excellent creep resistance and fatigue resistance.
Extremely high structural integrity: The forging process eliminates possible defects such as shrinkage cavities and gas holes in the casting. The grain flow direction is consistent with the shape of the tee, and the pressure-bearing capacity is stronger.
Excellent impact toughness: Even in low-temperature environments, it can maintain good impact toughness and prevent brittle fracture.
Outstanding corrosion and oxidation resistance: The high content of chromium (Cr) provides excellent oxidation and corrosion resistance.
Precise dimensions and smooth inner walls: Fine processing ensures that the dimensions meet the standards, and the inner walls are smooth, reducing pressure drop and medium deposition.
3. Technical Specifications
Product type: Equal diameter tee/reducer tee
Manufacturing process: Die forging/free forging + machining
Main material: P91 (American grade A335 P91, Chinese similar grade 10Cr9Mo1VNbN)
Size range
Diameter: DN15 - DN800 (NPS 1/2" - 32") or customized as required
Wall thickness: Sch80, Sch160, XXS, and various non-standard wall thicknesses
Execution standard
Design standards: ASME B16.9, ASME B16.11, MSS SP-97, GB/T 12459, DIN 2605, etc.
Material standard: ASME SA/A335 P91
Connection method: Butt Weld connection
4. Chemical composition and mechanical properties
Chemical composition (%) standard requirements
Carbon (C) 0.08-0.12
Manganese (Mn) 0.30-0.60
Silicon (Si) 0.20-0.50
Chromium (Cr) 8.00-9.50
Molybdenum (Mo) 0.85-1.05
Vanadium (V) 0.18-0.25
Niobium (Nb) 0.06-0.10
Nickel (Ni) ≤ 0.40
Nitrogen (N) 0.03-0.07
Standard requirements for mechanical properties (at room temperature)
Tensile strength ≥ 585 MPa
Yield strength ≥ 415 MPa
Elongation ≥ 20%
Hardness ≤ 250 HB
5. Production process flow
Raw material inspection → blanking → heating → forging → normalizing + tempering heat treatment → preliminary processing → non-destructive testing (UT/MT) → finishing → dimensional inspection → surface treatment → final inspection → painting and marking → packaging and leaving the factory
Heat treatment: Strictly follow the normalizing + tempering process to ensure that the P91 material acquires the required tempered martensite microstructure, thereby optimizing its high-temperature performance.
Non-destructive testing: 100% ultrasonic testing (UT) and magnetic particle testing (MT) are carried out to ensure there are no internal or surface defects.
6. Application fields
This product is widely used in the following key high-temperature and high-pressure fields:
Thermal power plant: main steam pipeline, reheating hot section/cold section pipeline, high-pressure bypass system.
Nuclear power industry: Auxiliary pipeline system for conventional islands.
Petrochemical industry: High-temperature cracking units, conversion furnace pipelines.
Boiler manufacturing industry: Boiler body connection, superheater, reheater system.
7. Quality Control
Jiangsu Gangyu Pipeline strictly adheres to the ISO 9001 quality management system. From the raw materials entering the warehouse to the finished products leaving the factory, every link is strictly monitored. We are equipped with spectrometers, universal testing machines, impact testing machines, hardness testers, ultrasonic and magnetic particle flaw detection equipment, etc., to ensure that every P91 forged three-way valve fully meets or even exceeds the standard requirements.
8. Our commitment
With profound professional knowledge in the field of steel pipe fittings and advanced production and testing equipment, we promise to provide you with
Reliable product quality: Ensuring long-term stable operation in harsh environments.
Precise dimensional tolerances: Ensure convenient and accurate on-site installation.
Professional technical support: We provide you with all-round services including selection, installation and after-sales support.
