On February 24, 2025, we received an inquiry for Alloy Steel Pipes & Fittings & Flanges. This inquiry came from a Vietnamese customer with whom we have been in contact since 2024. After careful review, we confirmed that all products met our supply capabilities and promptly provided a quotation. Additionally, we provided detailed data sheets and sample material test certificates as requested by the customer.
Since the inquiry is a tender, we fully supported our customer while end user proposed new demand, such as COC certificate etc. In this process, both of us treated seriously and check each item carefully when there’s update. Thankfully, we won the bid and got order 2 months later.
Alloy steel is widely used in high-demand fields such as petroleum, natural gas, chemical industry, electric power, boiler, nuclear energy, shipbuilding, machinery manufacturing, etc. due to its excellent high-temperature strength, corrosion resistance and pressure resistance. ZIZI professionally provides a full range of alloy steel pipes, pipe fittings and flanges to meet the stringent requirements of different industries for strength, temperature and pressure.
Product List
| No | Products | Short Description | Size | Qty | Unit |
| 1 | ELBOW | ELBOW.90, SW, F11, 1In, 6000lb | 1 | 5 | PCS |
| 2 | ELBOW | ELBOW.90, SW, F22, 9000lb, 3/4In | 3/4 | 4 | PCS |
| 3 | FLANGE | FLANGE, ASME, WN/RF, F11, 2In, 300lb | 2 | 3 | PCS |
| 4 | NIPPLE | NIPPLES, PE/NPT, F11, 1In, Sch.160 | 1 | 3 | PCS |
| 5 | NIPPLE | NIPPLES, PE/NPT, F22, 1In, Sch.XXS | 1 | 1 | PCS |
| 6 | PIPE | PIPE.SMLS, P11, 1In, Sch.160 | 1 | 6 | M |
| 7 | PIPE | PIPE SMLS A335-P22-S SCH XXS 3/4IN | 3/4 | 6 | M |
| 8 | TEE | TEE, EQUAL, SW, 6000#, F11, 3/4IN | 3/4 | 4 | PCS |
| 9 | TEE | TEE, EQUAL, SW, 9000#, F22, 1IN | 1 | 1 | PCS |
Alloy Steel Pipes Inspection photos
Alloy Steel Pipes Fittings Inspection photos
Alloy Steel Flanges Inspection photos
Alloy Steel Pipe Specification
| Processing Method: | Seamless and Welded |
| Size Range | 1/8” – 48” / DN6 – 1200 |
| Thickness Schedule | SCH 20- SCH 160, XXS |
| Length | 6m or 12 m or Random |
| Standard | ASME B36.10 |
| Surface Treatment | Blasting and Painting, Epoxy Powder FBE, 2PE, 3PE Coating |
| Material Grade | ASTM A335 P11 / P12 / P 5 / P9 / P91 / P92, A213 T11 / T12 / T22 / T5 / T9 / T91 / T92. 15CrMoG, 12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5 |
ASTM A335 Alloy Steel Pipe Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr | Mo |
| ASTM A335 P11 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | ||
| MAX | 0.15 | 0.60 | 0.025 | 0.025 | 1.00 | 1.50 | 0.65 | |
| ASTM A335 P22 | MIN | 0.05 | 0.30 | 1.90 | 0.87 | |||
| MAX | 0.15 | 0.60 | 0.025 | 0.025 | 0.50 | 2.60 | 1.13 |
ASTM A335 Alloy Steel Pipe Mechanical Property
| MATERIAL | ASTM A335 P11 | ASTM A335 P22 |
| T.S (MPA) | 415 min | 415 min |
| Y.S (MPA) | 205 min | 205 min |
| EL % | 30 min | 30 min |
Features
High strength and toughness: Able to withstand greater pressure and external impact.
Excellent temperature resistance: Can maintain sufficient strength and creep resistance at high temperatures, and still maintain good toughness at low temperatures, and is not prone to brittle fracture.
Excellent corrosion resistance: By adding elements such as chromium and nickel, the oxidation resistance and corrosion resistance are significantly improved.
Good weldability and processability: Most alloy steel pipes have good welding performance and are easy to carry out subsequent processing and installation.
Alloy Steel Pipes Fittings Specification
| Specifications : | ASTM A182 / ASME SA182 |
| Standard : | ASME B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, MSS-SP-97, BS3799 |
| Size : | 1/8″ NB to 4″ NB |
| Type : | Socket weld Fittings, Threaded Fittings |
| Rating Pressure : | Threaded End – 2000 /3000/ 6000 LBS. Socket-weld End – 3000 / 6000/ 9000 LBS. |
Classification of Alloy Steel Pipe Fittings
1. Classification by product type
This is the most common classification method, which is distinguished according to the function and shape of the pipe fittings:
Features: The pipe fittings have threads inside or outside, and are connected to the pipe by screwing with threads. Installation and removal are convenient and quick, and no welding is required.
Common types: Threaded elbows, threaded tees, threaded nipples, threaded couplings, threaded unions, threaded plugs, etc.
Features: The pipe fittings have a socket at one or both ends. After the pipe is inserted into the socket, it is connected by external fillet welding.
Common types: Socket-Weld elbows, socket-Weld tees, socket-Weld reducers, socket-Weld couplings, socket-Weld unions, socket-Weld pipe caps, etc.
Alloy Steel Flanges Specification
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2” – 48” / DN15 – DN1200 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
ASTM A182 Alloy Steel Pipe Fittings & Flanges Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
| ASTM A182 F11 CL1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.04 | 0.04 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL3 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F22 CL1，CL3 | MIN | 0.05 | 0.30 | 2.00 | 0.87 | ||||
| MAX | 0.15 | 0.60 | 0.04 | 0.04 | 0.50 | 2.50 | 1.13 |
ASTM A182 Alloy Steel Pipe Fittings & Flanges Mechanical Property
| MATERIAL | ASTM A182 F11 CL1 | ASTM A182 F11 CL2 | ASTM A182 F11 CL3 | ASTM A182 F22 CL1 | ASTM A182 F22 CL3 |
| T.S (MPA) | 415 min | 485 min | 515 min | 415min | 515min |
| Y.S (MPA) | 205 min | 275 min | 310 min | 205min | 310min |
| EL % | 20 min | 20 min | 20 min | 20min | 20min |
| R/A % | 45 min | 30 min | 30 min | 35min | 30min |
| HARDNESS | 121-174 | 143-207 | 150-207 | 170 | 156-207 |
Alloy Steel Flanges Types:
Welding Neck Flange
Slip On Flange
Socket Weld Flange
Threaded Flange
Blind Flange
Lap Joint Flange
Dimensions and Standards
The dimensions of alloy steel pipes, fittings and flanges also follow strict international and national standards to ensure interchangeability and system compatibility. The main standards include:
Pipes: ASTM A335 (seamless ferritic alloy steel pipes for high temperature applications), ASTM A213 (seamless ferritic and austenitic alloy steel pipes for boilers, superheaters and heat exchangers), etc.
Fittings: ASME B16.9 (factory-made butt-weld fittings), ASME B16.11 (socket-weld and threaded forged fittings), etc.
Flanges: ASME B16.5 (pipe flanges and flange fittings, sizes NPS 1/2 to NPS 24), ASME B16.47 (large diameter steel flanges, sizes NPS 26 to NPS 60), etc.