Precision Seamless Steel Tube ASTM A519 / ASME SA519 with 6–450 mm OD and 1020-4140 Steel Grades for Mechanical Engineering
Price:
600-1200
MOQ:
1000 kgs
Delivery Time:
4-6 weeks
Brand:
Torich
Product Description
Mechanical Engineer Precision Seamless Steel Tube With Carbon / Alloy
Mechanical Engineering Precision Seamless Steel Tube With Carbon / Alloy Steel
Mechanical engineering precision seamless steel tubes are supplied for machined parts, shafts, bushings, sleeves, hydraulic components, and structural mechanical assemblies where weld-free tube body, controlled OD/wall size, machinability, heat-treatment response, and stable mechanical properties are required. This product is based mainly on ASTM A519 / ASME SA519 seamless carbon and alloy steel mechanical tubing, covering hot-finished and cold-finished mechanical tubing grades such as 1020, 1035, 1045, 4130, and 4140.
Specifications
| Item | Description |
|---|---|
| Material | Seamless carbon steel and alloy steel |
| Main Standard | ASTM A519 / ASME SA519 |
| Steel Grades | 1020, 1035, 1045, 4130, 4140; other grades available on request |
| Outside Diameter | 6-450 mm |
| Wall Thickness | 1-30 mm |
| Length | 1-12 m, custom cut length available |
| Tolerance Range | As per ASTM A519 or agreed drawing tolerance; cold-finished tubes available for tighter OD/wall control |
| Straightness | Typically ≤1.5 mm/m; tighter straightness available after straightening |
| Surface Condition | Hot finished, cold drawn, pickled, oiled, polished, or machined surface |
| Heat Treatment | HR, CW, SR, A, N; quenched and tempered condition available for alloy grades by agreement |
| Tube Shape | Round standard; square, rectangular, and special sections available by agreement |
| End Finish | Plain end, deburred, chamfered, or cut-to-length |
Main Features
| Feature | Technical Detail |
|---|---|
| Seamless tube body | No longitudinal weld seam, suitable for mechanical parts requiring uniform wall integrity and machining stability. |
| Size range | OD 6-450 mm, wall thickness 1-30 mm, length up to 12,000 mm. |
| Carbon and alloy grade options | 1020 for low-carbon machinable parts; 1035/1045 for higher carbon strength; 4130/4140 for Cr-Mo alloy strength and heat-treatment response. |
| Controlled carbon range | 1020: C 0.18-0.23%; 1045: C 0.43-0.50%; 4130: C 0.28-0.33%; 4140: C 0.38-0.43%. |
| Alloy strengthening | 4130 and 4140 contain Cr 0.80-1.10% and Mo 0.15-0.25%, improving hardenability and strength after heat treatment. |
| Multiple delivery conditions | HR, CW, SR, A, and N conditions are available to balance machinability, yield strength, elongation, and hardness. |
| High-strength option | 4140 HR/SR condition reaches 120 ksi / 855 MPa tensile strength in the reference data. |
| Machining suitability | Applicable to bushings, sleeves, shafts, pins, cylinder components, and machined mechanical parts. |
Our Advantages
| Professional Concern | Our Solution |
|---|---|
| OD/wall tolerance and finished ID control | For machined mechanical components, we confirm critical dimensions before production: OD-controlled, ID-controlled, wall-controlled, or machining-allowance-controlled. |
| Correct grade and heat-treatment condition | We match 1020, 1035, 1045, 4130, or 4140 with HR, CW, SR, A, or N condition according to machining, forming, hardness, and strength requirements. |
| Stable surface and mechanical performance | We control cold drawing, straightening, surface protection, heat treatment, and inspection records to reduce variation between batches. |
Execution Standards
| Standard System | Applicable Standard | Short Description |
|---|---|---|
| ASTM / ASME | ASTM A519 / ASME SA519 | Seamless carbon and alloy steel mechanical tubing; hot-finished or cold-finished. |
| EN | EN 10305-1 | Seamless cold-drawn precision steel tubes with defined dimensional tolerances and surface quality. |
| EN | EN 10297-1 | Seamless circular steel tubes for mechanical and general engineering purposes. |
| JIS | JIS G3445 | Carbon steel tubes for machine structural purposes. |
| GB | GB/T 3639 | Seamless cold-drawn or cold-rolled precision steel tubes for precision applications. |
| GB | GB/T 8162 | Seamless steel tubes for structural purposes. |
| GOST | GOST 8733 / GOST 8734 | Cold-worked seamless steel tubes and dimensional requirements. |
Application Field
Hydraulic cylinder barrel for construction machinery — precision seamless carbon/alloy steel tubes can be used as the base tube for honed or skived-and-roller-burnished hydraulic cylinder barrels, where straightness, wall uniformity, machinability, and stable mechanical properties are required.
Chemical Composition
| Grade | C % | Mn % | P max % | S max % | Si % | Cr % | Mo % |
|---|---|---|---|---|---|---|---|
| 1020 | 0.18-0.23 | 0.30-0.60 | 0.040 | 0.050 | -- | -- | -- |
| 1035 | 0.32-0.38 | 0.60-0.90 | 0.040 | 0.050 | -- | -- | -- |
| 1045 | 0.43-0.50 | 0.60-0.90 | 0.040 | 0.050 | -- | -- | -- |
| 4130 | 0.28-0.33 | 0.40-0.60 | 0.040 | 0.040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
| 4140 | 0.38-0.43 | 0.75-1.00 | 0.040 | 0.040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
Mechanical Properties
| Grade | Condition | Tensile Strength ksi | Tensile Strength MPa | Yield Strength ksi | Yield Strength MPa | Elongation % | Rockwell Hardness B Scale |
|---|---|---|---|---|---|---|---|
| 1020 | HR | 50 | 345 | 32 | 221 | 25 | 55 |
| 1020 | CW | 70 | 483 | 60 | 414 | 5 | 75 |
| 1020 | SR | 65 | 448 | 50 | 345 | 10 | 72 |
| 1020 | A | 48 | 331 | 28 | 193 | 30 | 50 |
| 1020 | N | 55 | 379 | 34 | 234 | 22 | 60 |
| 1035 | HR | 65 | 448 | 40 | 276 | 20 | 72 |
| 1035 | CW | 85 | 586 | 75 | 517 | 5 | 88 |
| 1035 | SR | 75 | 517 | 65 | 448 | 8 | 80 |
| 1035 | A | 60 | 414 | 33 | 228 | 25 | 67 |
| 1035 | N | 65 | 448 | 40 | 276 | 20 | 72 |
| 1045 | HR | 75 | 517 | 45 | 310 | 15 | 80 |
| 1045 | CW | 90 | 621 | 80 | 552 | 5 | 90 |
| 1045 | SR | 80 | 552 | 70 | 483 | 8 | 85 |
| 1045 | A | 65 | 448 | 35 | 241 | 20 | 72 |
| 1045 | N | 75 | 517 | 48 | 331 | 15 | 80 |
| 4130 | HR | 90 | 621 | 70 | 483 | 20 | 89 |
| 4130 | SR | 105 | 724 | 85 | 586 | 10 | 95 |
| 4130 | A | 75 | 517 | 55 | 379 | 30 | 81 |
| 4130 | N | 90 | 621 | 60 | 414 | 20 | 89 |
| 4140 | HR | 120 | 855 | 90 | 621 | 15 | 100 |
| 4140 | SR | 120 | 855 | 100 | 689 | 10 | 100 |
| 4140 | A | 80 | 552 | 60 | 414 | 25 | 85 |
| 4140 | N | 120 | 855 | 90 | 621 | 20 |
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: Manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, according to quantity.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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Company
TORICH INTERNATIONAL LIMITED
Location
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact Person
Richard SHEN