A519 Seamless alloy steel High Corrosion Resistance Alloy Steel Seamless Pipe

1. Manufactured to ASTM A519 standard for seamless carbon & alloy mechanical tubing, supporting hot-finished and cold-drawn forming processes, compliant with ASTM A691, ASME SA335 supplementary standards
2. Dual supply: Seamless alloy tube & ERW welded alloy pipe, full size range OD 5mm–1219.2mm (1/8''~26''), wall thickness SCH5–XXS up to 30mm heavy wall
3. Flexible length customization: Single random, double random or fixed cut length up to max 23m; standard stock length up to 6m
4. Multiple pipe end options: Plain end, beveled end, threaded end with plastic end caps to avoid transport collision damage
5. Versatile surface anti-corrosion treatment: Hot galvanizing (10~50g/m² zinc layer), black anti-rust paint, bare raw finish or custom coating
6. Rich alloy grade inventory: 1-1/4CR, 2-1/4CR, 5CR, 9CR91, 4130, 4140, Cr-Mo boiler alloy series for machinery & high-temperature pressure service
7. Strict factory inspection: Hydrostatic test, ultrasonic & eddy current non-destructive testing, tensile/hardness mechanical performance inspection before delivery
8. Custom deep machining service: Cutting, drilling, turning, grinding, CNC forming for hydraulic cylinder, shaft, mechanical structural blank

ASTM A519 seamless alloy steel tubing is specialized mechanical seamless pipe designed for precision machining, hydraulic systems and structural components, distinct from boiler pressure pipes (SA335). It adopts hot extrusion and cold drawing processes to achieve ultra-precise dimensional tolerance and smooth inner/outer surface, excellent for secondary CNC processing, heat treatment and bending forming.

We supply two production types: seamless mechanical alloy tube and ERW welded alloy pipe. Nominal bore covers 1/8'' to 24'' NB, wall thickness from thin SCH5 to heavy wall 30mm. All batches adopt standardized bundling packaging with unified furnace number marking to guarantee batch consistency for long-distance sea transportation.

Matching international standards including GB, EN, BS, JIS, it serves machinery manufacturing, aerospace, petroleum, power boiler and military equipment, meeting both low-load mechanical structural and medium-high temperature pressure transmission working demands.

• Ferritic chromium-molybdenum alloy steel with balanced strength, ductility and machinability
• Minimum tensile strength 415MPa, minimum yield strength 205MPa, elongation ≥30%, good plastic deformation performance for bending/flanging
• Excellent hardening response after heat treatment, widely used for hydraulic parts, automobile shafts, machinery hollow blanks
• Matches A691 welded alloy grades (1-1/4CR, 5CR, 9CR91) for high-temperature pipeline supporting
• Compatible with welding, cold drawing, grinding and all common metal processing operations

• High chromium alloy welded pipe with outstanding high-temperature oxidation & creep resistance
• Optimized for power station boiler, petrochemical high-temperature fluid transmission pipelines
• Heavy wall thickness up to 30mm, suitable for high-pressure, long-cycle industrial service

We supply matching seamless & welded alloy pipe, stainless tube, carbon hollow section for full industrial working conditions:

1. ASTM A519 Mechanical Alloy Series: 4130, 4140, 1020, 1025, 1-1/4CR, 5CR, 9CR91
2. High-Temperature Boiler Alloy Pipe: ASME SA335 P11/P12/P22/P91, SA213 T12, DIN St45.8
3. Carbon Structural Pipe: ASTM A500 A36, SS400 square/rectangular hollow section
4. Corrosion Resistant Special Alloy: Alloy 28 N08028, Inconel 625, ASTM B167 nickel alloy tube
5. Stainless Steel Pipe: 304, 316L, 321 forged flange matching pipe fittings

Cold-drawn A519 tubing achieves tight OD/wall tolerances, smooth surface, ideal for turning, grinding, boring to make hydraulic cylinders, piston sleeves and mechanical shafts.

Cr-Mo alloy formula provides stable strength at medium high temperature; tensile strength ≥415MPa supports pressure fluid delivery and heavy load structural components.

Seamless tube for high-pressure precision machinery; large diameter welded pipe for low-medium pressure boiler/petrochemical pipelines, flexible cost selection.

Hot galvanizing, 3PE, anti-rust paint optional coatings effectively prevent rust during marine and outdoor service life.

Steel strip bundling, end plastic caps, unified batch marking; same furnace number & specification bundled together to avoid mixing and transport damage.

Each batch passes hydrostatic, UT, eddy current test; provide ISO, PED, factory material test certificates for global engineering customs clearance.

• Machinery manufacturing: Hydraulic cylinder barrels, gear blanks, hollow transmission shafts, precision mechanical structural parts
• Petroleum & petrochemical: Medium temperature process fluid pipelines, refinery auxiliary piping
• Power & boiler industry: Heat exchange tubes, medium-pressure boiler supporting pipelines (A691 heavy wall grades)
• Aerospace & military equipment: Lightweight high-strength alloy tubular structural components
• Automobile industry: Chassis hollow parts, suspension alloy tubing
• General engineering: High-pressure water/gas transmission pipelines, heat exchanger equipment

We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:

• Turning, milling, planing, drilling, boring, grinding
• Gear cutting, CNC precision machining
• Sizing cutting, surface treatment and finishing

We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:

• Ultrasonic testing (UT) for internal defects
• Tensile and hardness testing for mechanical properties
• High-precision dimensional measurement
• Spectrometer for chemical composition verification
• Metallographic microstructure inspection

Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.

• Inner packaging: waterproof polybag for moisture and dust protection
• Outer packaging: reinforced wooden case / wooden pallet, suitable for long-distance international transportation
• Custom packaging solutions available upon request

• Normally 10 – 45 days after receipt of advance payment
• Exact delivery time depends on order quantity, specification complexity and machining requirements