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ASTM A335 GR.P9 Alloy Steel Seamless Studded FinTube Manufacture
What is studded fin tube?
Studded fin tube is made by electrical resistance welding specially formed studs(round pins ) in rows around the tube. The Studs can be supplied in a variety of sizes and shapes. Stud tube has a very high heat transfer efficiency. The heat exchange efficiency is equivalent to 2-3 times that of the bare pipe.
A335 is often called chrome moly pipe because of the chemical makeup of Mo and Cr. Mo increases the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability. Moly increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is the most effective single additive that increases high temperature creep strength. It also enhances the corrosion resistance of steel, and inhibits pitting.
A335/SA335 P9 is a seamless ferritic alloy-steel pipe used for
high-temperature applications. These pipes are versatile and can be
used to transmit water, oil and natural gas. Key to the composition
of chrome moly alloy P9 is the addition of chromium and molybdenum.
Fin Tube Detail
| Base Tube Part | Fin Part | ||||||||
| Specification | Material Grade | Major Sizes | Material Grade | Fin Type | Fin Height | Fin Thickness | Fin Qty | Fin Dia. | Bare Length |
| ASTM A213 ; ASME SA213; ASTM A249; ASME SA249; ASTM A269; ASME SA269; ASTM A312; ASME SA312; ASTM A376; ASME SA376; ASTM A789; ASME SA789; ASTM A790; ASME SA790 | TP304, TP304L, TP304H, TP310S, TP310H, TP316L, TP317L, TP321, TP321H, TP347, TP347H , S31803, S32205, S32750, S32760 | Tube Size: 15.875 X 1.65; 15.875 X 2.11; 15.875 X 2.77; 19.05 X 1.65; 19.05 X 2.11; 19.05 X 2.77; 25.4 X 2.11; 25.4 X 2.77; 25.4 X 3.05; 25.4 X 3.4; 31.75 X 2.11; 31.75 X 2.77; 31.75 X 3.05; 31.75 X 3.4; 38.1 X 2.11; 38.1 X 2.77; 38.1 X 3.05; 38.1 X 3.4; 44.45 X 2.11; 44.45 X 2.77; 44.45 X 3.05; 44.45 X 3.4; 44.45 X 3.81; 44.45 X 4.57; 50.8 X 2.11; 50.8 X 2.77; 50.8 X 3.05; 50.8 X 3.4; 50.8 X 3.81; 50.8 X 4.57; 57.15 X 2.11; 57.15 X 2.77; 57.15 X 3.05; 57.15 X 3.4; 57.15 X 3.81; 57.15 X 4.57; 63.5 X 2.11; 63.5 X 2.77; 63.5 X 3.05; 63.5 X 3.4; 63.5 X 3.81; 63.5 X 4.57; Pipe Size: 2 1/2" SCH40 (73.03 X 5.16); 2 1/2" SCH80 (73.03 X 7.01); 3" SCH40 (88.9 X 5.49); 3" SCH40 (88.9 X 7.62); 3 1/2" SCH40 (101.6 X 5.74); 3 1/2" SCH80 (101.6 X 8.18); 4" SCH40 (114.3 X 6.02); 4" SCH80 (114.3 X 8.56); 5" SCH40 (141.3 X 6.55); 5" SCH80 (141.3 X 9.27); 6" SCH40 (168.3 X 7.11); 6" SCH80 (168.3 X 10.97); 8" SCH40 (219.1 X 8.18); 8" SCH80 (219.1 X 12.7); Length Max.: 25M/PC; other sizes depend on customer request | Stainless Steel: SS304, SS304L, SS316L, SS317L, SS347, SS310; SS409 (1CR12), SS410(1Cr13); Carbon Steel(CS) , Alloy Steel: ASTM A387 Gr.A, Gr.B, Gr.C; Aluminum ASTM A209 / ASME SA209 AL1060, Gr.6061; ASME SA210/ ASTM A210 AL1060 , AL1100, Gr.6061, Gr.6063, ASTM A221/ ASME SA221 AL 1060 , Gr.6061, Gr.6063 Alloy Steel: P11, P22, P5, P9 | Solid Fin : High Frequency Weldding(HFW), Serrated Fin Tube, Studded Tube /Pin Tube, Square Fin Tube, H Type Fin tube, HH type Fin tube; Embedded : G Type Fin Tube; Wound: L, LL, KL ; Extruded; Thread Fin tube ; Low Fin tube; Corrguated Fin Tube; Bamboo Tube; U bend Fin tube | 1.6mm ~60mm | 0.2mm~3.0mm | Depend on client request | 12.7mm~25.4mm | 40mm~client request |
| EN10216-5; EN10217-7; DIN 17456; DIN17457; DIN17458 | 1.4301,1.4305, 1.4306, 1.4307, 1.4571,1.4401, 1.4404, 1.4541, 1.4948, 1.4550, 1.4912, 1.4845, 1.4462, 1.4539, 1.4438, 1.4501 | ||||||||
| ASTM A335; ASME SA335; ASTM A213; ASME SA213 | T1, T11, T12, T22, T23, T5, T9, T91, T92, P1, P11, P12, P22, P23, P5, P9, P91, P92 | ||||||||
| ASTM A53; ASTM A106, ASME SA106 | GR.A, GR.B, GR.C | ||||||||
| ASTM A178; ASME SA178; ASTM A179, ASME SA179; ASTM A192; ASME SA192; ASTM A209; ASME SA209; ASTM A210; ASME SA210; ASTM A 214; ASME SA214; ASTM A333; ASME SA333 | Gr.A, Gr.B, Gr.C, A179, A192, T1a, T1b Gr.A1, Gr.1, Gr.3, Gr.6 | ||||||||
| ASTM B161; ASME SB161; ASTM B163; ASME SB163; ASTM B164; ASME SB164; ASTM B165; ASME SB165; ASTM B167; ASME SB167; ASTM B407; ASME SB407; ASTM B444; ASME SB444; ASTM B622; ASME SB622; ASTM B388; ASME SB388 | Grade:Hestalloy:C-276, C-4, C-22, C-2000, X, B-2, B-3, G-30, G-35. Monel:400,401, 404, R-405, K500. Inconel:600, 601, 617, 625, 690, 718, 740, X-750. Incoloy:800, 800H, 800HT, 825, 840. Pure Nickel:Ni-200, Ni-201, Ni-270. NS Alloy:Ns 1101, NS1102, NS1103,NS3105. Titanium : Gr.2 , Gr.5, Gr.7, Gr.9 ; | ||||||||
Features of a Studded Fin Tube:
-It occupies less space and is, therefore, compact
-Highly durable
-Preferred over Finned tubes as they act as heat transfer systems
-Enhanced performance
Package:
Size Reference for Different Types of Fin Tubes
| Type | Description | Base tube | Fin specification (mm) | ||
| O.D. (mm) | Fin pitch | Fin height | Fin thick | ||
| Embedded | G-type fin tueb | 16-63 | 2.1-5 | <17 | ~0.4 |
| Extruded | Single metal combined metal | 8-51 | 1.6-10 | <17 | 0.2-0.4 |
| Low fin tube t-type fin tube | 10-38 | 0.6-2 | <1.6 | ~0.3 | |
| Bamboo tube corrugated tube | 16-51 | 8-30 | <2.5 | / | |
| Wound | l/kl/ll type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3-25 | 5-30 | 0.8-3 |
| H/HH type fin tube | 25-63 | 8-30 | <200 | 1.5-3.5 | |
| Studed fin tube | 25-219 | 8-30 | 5-35 | φ5-20 | |
Chemical Composition Of GR.P9
| Cr, % | C, % | P, % | S, % | Mo, % | Mn, % | Si, % |
| 4.00-6.00 | 0.15 max | 0.025 max | 0.025 max | 0.45-0.65 | 0.30-0.60 | 0.50 max |
ASTM A335 P9 Pipe Mechanical And Physical Properties
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
| 415 min | 205 min | 30 min |
Equivalent Material of Alloy Steel P9
| ASTM | JIS G 3458 | UNS | BS | ISO |
|---|---|---|---|---|
| P9 | STPA 26 | S50400 | 3604 P1 629-470 | 2604 II TS38 |
Applications:
-Power Plants
-Chemical Industry
-Heat Recovery Plants
-Heat Industry
-Steam Boiler
-Oil Refining
