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ASTM A519 GRADE 4145H COLD DRAWN ALLOY STEEL SEAMLESS PIPES/TUBES
Products Description
Seamless pipe is a pipe without a seam or a weld-joint. It is alos called CDS pipes (Cold drawn seamless pipe). It’s is used widely in maching parts, shafts, bearings, cylinders having strength of 75000 PSD tensile. It is a solid carbon steel rod which is pushed on to the mandrel to form the shape of tube.
Alloy steel seamless steel pipe is kind of long steel. Steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight under the same bending and torsional strength. It is an economic section steel. It is widely used in manufacturing structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction.
ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. The standard is also acceptable in the manufacture of piping. It is manufactured by hot working and then cold finishing the steel into round, square, rectangle or special shapes.
AISI 4145H is a chromium molybdenum quality alloy steel specification. As a high tensile steel grade AISI 4145H is primarily supplied in the hardened and tempered condition to 30-36HRc range to AISI 4145H modified. With a slightly higher carbon content AISI 4145H is similar to AISI 4140 in that it offers good ductility, shock resisting characteristics combined with resistance to wear.
Common Applications
AISI 4145H is the upgraded type of AISI 4145. AISI 4145H has improved hardenability and is commonly used in the high strength condition with min.110 KSI yield and suitable for downhole drilling tools, and general engineering applications include components exposed to heavy strain. AISI 4145H can also be used in hardened condition as machine parts exposed to heavy wear.
STANDARD SPECIFICATIONS
| Process | Seamless |
| Shape | Round |
| Size Range | Cold Drawn: 6-426mm OD; 1-40mm WT Hot Finished: 32-1200mm OD; 3.5-200mm WT |
| Thickness | Upto 200mm |
| Pipe End | Plain / Beveled / Vanished / Plastic Caps |
| Coating | Black / Galvanised / 3LPE / Turned / Peeled / Grinded / Polished / Anti – Corrosion Oil |
| Length | 15 Mtr max Cut to Length available |
| Heat Treatment | Spheroidizing / Full Annealing / Process Annealing / Isothermal Annealing / Normalizing / Quenching / Martempering (Marquenching) / Quench And Tempering / Austempering |
| Application | Oil & Gas / Hydro Carbon Process / Automotive / Boiler, Heat Exchanger / Plumbing, HVAC & Firefighting / Structural / General Engineering / Railways / Sewage & Waterwell |
| Quality Inspection | Third Party inspection is acceptable (SGS, BV etc.) |
TOLERANCE FOR SEAMLESS TUBING
| I.D tolerance (mm) | O.D tolerance (mm) | Straightness (mm) |
| H9-H12 | -/+0.5% | 0.20-0.80 |
The chemical composition of AISI 4145H is as follows
| C | Mn | Si | P | S | Cr | Ni | Mo |
| 0.43-0.49 | 0.85-1.10 | 0.10-0.35 | 0.035 max | 0.040 max | 0.80-1.10 | 0.25 max | 0.15-0.25 |
The mechanical property of AISI 4145H is as follows
| Tensile Strength Rm (KSI) | Yield Strength R2 (KSI) | Elongation (%) | Reduction Ration (%) | Izod Impact (J) | Charp Impact (J) | Hardness (HBW) |
| 140 min | 120 min | 14 min | 40 min | 30-36 | 248-302 | 123 |
Processing
Below inspection will be done in the production. (1) ray detection---RT; (2) ultrasonic testing---UT; (3) Magnetic Particle Testing-MT; (4) penetration testing-PT; (5) eddy current flaw detection-ET
the production of 4130 alloy steel pipes for boiler pipes involves several inspections to ensure that the pipes meet the required standards. These inspections include RT, UT, MT, PT, and ET, which are all non-destructive testing methods that enable the manufacturer to identify any defects or imperfections in the material. With this rigorous production process, customers can be assured that they are getting high-quality products that are safe and efficient for their intended use.
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