CRA Seamless Pipe Special Alloys For Petrochemical Industry With 8.0g/cm3 Density

Corrosion resistant alloy (CRA) seamless pipe Alloy 28, UNS N08028 (28Cr) for API tubing and casing

1 PRODUCT

Corrosion resistant alloy (CRA) seamless pipe Alloy 28, UNS N08028 (28Cr) for API tubing and casing

2 EQUIVALENT DESIGNATION

W.Nr. 1.4563, Incoloy® alloy 28

3 OVERVIEW

Alloy 28 is a highly alloyed austenitic stainless steel offering resistance to a variety of corrosive media. By virtue of its contents of chromium and molybdenum, the alloy offers resistance to both oxidizing and reducing acids and salts. The presence of copper increases its resistance to sulfuric acid.

4 APPLICATION

Alloy 28 is used in the chemical and petrochemical processing industry. Alloy 28 tubes are cold worked to high strength levels for downhole service in moderately corrosive deep sour gas wells.

5 CHEMICAL COMPOSITION

6 PHYSICAL PROPERTIES

Density: 0.29 lb/in³ (8.0g/cm³)

Specific Heat: (32-212°F), 0.105 Btu lb °F ((0-100°C), 450 J/kg °C)

Coefficient of Expansion, 10^-6 in/in °F (microm/m °C)

70-200°F (21-93°C) 8.3 (15.0)

70-500°F (21-260°C) 8.8 (15.9)

70-800°F (21-427°C) 9.3 (16.8)

Thermal Conductivity^A, 66 Btu in/ft² h °F(11.4 W/m°C )

Electrical Resistivity^A, 594 ohm circ mil/ft (0.99 micro ohm m)

Young’s Modulus^A, 29.0 x 10³ ksi (200 GPa)

^A Annealed product, tested at room temperature

7 MECHANICAL PROPERTIES

Typical mechanical properties

8 TUBING SIZES

OD: 3-1/2 inch (88.9mm), 4 inch (101.6mm), 4-1/2 inch (114.3mm)

WT: 5.49mm - 16.00mm

Length: R1 (6.10 - 7.32m), R2 (8.53 - 9.75m), R3 (11.58 - 12.80m)

9 CASING SIZES

OD: 4-1/2 inch (114.3mm), 5 inch (127.0mm), 5-1/2 inch (139.7mm), 6-5/8 inch (168.28mm), 7 inch (177.8mm), 7-5/8 inch (193.68mm), 7-3/4 inch (196.85mm), 8-5/8 inch (219.08mm)

WT: 5.21mm - 22.22mm

Length: R1 (4.88 - 7.62m), R2 (7.62 - 10.36m), R3 (10.36 - 14.63m)

10 DIMENSION TOLERANCE

The following tolerances apply to the outside diameter, D, of pipe

Wall thickness: tolerance for pipe –12.5 %

Inside diameter: inside diameter, d, is governed by the outside diameter and mass tolerances.

11 HOT EXTRUSION PROCESS

Bar → Inspection → Peeling → Cutting → Boring → Chamfering → Inspection → Cleaning → Preheating → Induction heating → Broaching → Induction heating → Hot extruding → Heat treatment → Straightening → Saw cutting → Pickling → Inspection & repairing → CR(CD) → Deoil → Heat treatment → Straightening → Cut to length → Pickling → NDT (Eddy-current inspection, UT, Hydraulic pressure inspection)→Packing

12 FEATURE OF EXTRUDED SEAMLESS TUBE

Extrusion pipe production is completely different from skew rolling and roller rolling and has following characteristics

(1) Compared with other methods of tube process, extrusion method is characteristic of the metal in the process of forming through three-way compressive stress, which can be used to produce low plasticity steel and alloy, such as zirconium alloy, titanium alloy, Ni-Cr-Fe heat resistant alloy, etc for application of atomic energy industry and special chemical industrial. And good surface quality could be obtained.

(2) Extrusion method has great flexibility and mobility due to the simple die, easy to manufacture and replace.

(3) The specification range of tube produced by extruder is larger than other process.

(4) Compared with other methods of tube process, extrusion can get better quality, the mechanical properties of tube are more even, and the inner and outer surface of the tube is better than that of rolling.

13 HOT EXTRUDING UNIT

(1) 25MN broaching machine and 63MN horizontal extruder imported from Danieli of Italy. Max. extruding speed:300mm/s, max extrusion force 62.17MN, annual production capacity 40000MT.

(2) Extruded pipe size:Φ60～325mm×6～40mm

(3) Extruded pipe length:3000～18000mm

(4) Single pipe billet weight:≤1.2MT

(5) Extruded pipe tolerance: diameter ±1%, Wall thickness ±10%

(6) Suitable for ultra long and ultra thick pipe, size 168 x 10 x 14000mm, single pipe weight 550kg

(7) Main material:austenitic stainless steel, martensitic stainless steel, duplex stainless steel, super stainless steel, nickel-based alloy, Metallurgy composite bimetallic seamless tube , shaped pipe etc.

14 MAIN EQUIPMENT

15 HOT PERFORATION PROCESS

Bar → Inspection → Peeling → Cutting → Centering → Heating → Perforation → Pickling → End cutting → Inspection and repairing → CR(CD) → Deoil → Heat treatment → Straightening → Cut to length → Pickling → UDT (Eddy current inspection, UT, Hydraulic pressure inspection) → Packing

16 HEAT TREATMENT

The recommended heat treatment for UNS N08028 shall consist of heating the material to a temperature of 1975 to 2100°F (1080 to 1150°C) with subsequent quenching in water or rapidly cooling by other means.

The scale shall be removed by suitable means. When bright annealed, scale removal operations are not necessary.

17 COMPETITIVE ADVANTAGE

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.
(4) Excellent performance when running in oil-gas well several tens of thousands of meters deep.

(5) We have terminal customers like Baker Hughes, Halliburton, China national offshore oil corporation LTD (CNOOC), etc.

18 PRODUCT FORMS

Pipe and tube: shall be furnished in the solution-annealed condition.

19 STANDARD SPECIFICATION

Alloy 28 is listed in NACE MR0175.

API 5CT Specification for casing and tubing

ASTM B668 / ASME SB668 Standard Specification for UNS N08028 and N08029 Seamless Pipe and Tube

ASTM B829 / ASME SB829 Standard specification for General Requirements for Nickel and Nickel Alloys

20 BUSINESS TERM