Honed Tube
Honed Tube - seamless steel tube
Factory supply mechanical & automobile precision seamless tubes, stress relief annealing, full NDT inspection, custom bending, threading, turning machining, complete MTC certification for automotive OEM & machinery manufacturers.
Mechanical & automobile seamless tubes are cold-drawn precision seamless pipes specially designed for structural, transmission and hydraulic components of machinery and automotive vehicles. Compared with hot rolled tubes, cold drawn production achieves ultra-tight outer/inner diameter tolerance, uniform wall thickness and smooth inner & outer surfaces, which greatly improves machining yield and component fatigue resistance after welding, bending and turning.
We produce full series carbon and alloy mechanical tubing complying with international standards ASTM A519, EN 10268, DIN 2448, supporting automobile OEM, auto parts tier1 suppliers, construction machinery and general mechanical equipment manufacturers with one-stop precision tube supply & secondary machining service.
| Standard System | Standard Code | Application Scope |
|---|---|---|
| American ASTM | ASTM A519 / A519M | US automobile, heavy machinery alloy structural tubing |
| European EN | EN 10268, EN 10305 | EU auto OEM, light vehicle precision cold drawn tube |
| German DIN | DIN 2448, DIN 2391 | European commercial vehicle, hydraulic mechanical parts |
| Chinese GB | GB/T 3639, GB/T 8162 | Domestic auto parts, general machinery structural pipe |
| Grade | C Max | Mn Range | Si | P Max | S Max | Alloy Elements |
|---|---|---|---|---|---|---|
| ST45 / 45# | 0.49 | 0.50~0.80 | 0.17~0.37 | 0.035 | 0.035 | No alloy |
| ST52 / E355 | 0.22 | 1.30~1.60 | 0.10~0.40 | 0.030 | 0.030 | Low Mn alloy |
| ASTM A519 1026 | 0.23~0.29 | 0.30~0.60 | 0.15~0.35 | 0.025 | 0.025 | Carbon structural steel |
| 4130 Cr-Mo Alloy | 0.28~0.33 | 0.40~0.60 | 0.15~0.35 | 0.025 | 0.025 | Cr, Mo |
| 4140 Cr-Mo Alloy | 0.38~0.43 | 0.75~1.00 | 0.15~0.35 | 0.025 | 0.025 | Cr, Mo |
Carbon grades ST45/E355 for light load auto frames and general machinery; 4130/4140 Cr-Mo alloy for heavy load automobile suspension, transmission and high fatigue mechanical parts.
| Mark | Treatment State | Auto & Machinery Application |
|---|---|---|
| BK | Cold Hard (No Annealing) | Rigid mechanical shaft sleeves, non-bending structural supports |
| BKW | Stress Relieved | General auto frame tubes, light bending components |
| GBK | Fully Annealed | Auto suspension arms, U-bent chassis parts, easy forming machining |
| NBK | Normalized | High fatigue transmission tubes, heavy load automobile axle sleeves |
EN 10204 3.1 / 3.2 official MTC test certificate issued for all batches, fully meet automobile OEM third-party audit requirements.
Mechanical & automobile seamless tubes are bundled with high-strength steel straps, plastic protective end caps installed on both tube ends to prevent scratch and collision damage of precision surfaces. Anti-rust oil coated inside and outside for long-distance ocean transportation.
Each bundle contains tubes of identical heat batch, grade and dimension with clear identification label. Wooden pallet or full container loading available, support EXW / FOB / CIF / DAP international trade settlement terms for global auto parts and machinery importers.
Sunny Steel maintains an extensive inventory of carbon and alloy steel seamless mechanical tubing, including boiler tubes, condenser tubes and heat exchanger tubes, all manufactured in China.
Our carbon steel pressure tubing is produced in accordance with ASME SA-178 A and/or ASME SA-214, available in diameters from 3/4" to 4". ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing and is also accepted for piping applications.
| Grade | C | Mn | P ≤ | S ≤ | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| 1008 | 0.10 | 0.30–0.50 | 0.040 | 0.050 | – | – | – |
| 1010 | 0.08–0.13 | 0.30–0.60 | 0.040 | 0.050 | – | – | – |
| 1018 | 0.15–0.20 | 0.60–0.90 | 0.040 | 0.050 | – | – | – |
| 1020 | 0.18–0.23 | 0.30–0.60 | 0.040 | 0.050 | – | – | – |
| 1025 | 0.22–0.28 | 0.30–0.60 | 0.040 | 0.050 | – | – | – |
| 1026 | 0.22–0.28 | 0.60–0.90 | 0.040 | 0.050 | – | – | – |
| 4130 | 0.28–0.33 | 0.40–0.60 | 0.040 | 0.050 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
| 4140 | 0.38–0.43 | 0.75–1.00 | 0.040 | 0.050 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
CW = Cold Worked | SR = Stress Relieved | A = Annealed | N = Normalized
| Grade | Condition | Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|---|---|---|---|---|
| 1020 | CW | 414 | 483 | – |
| SR | 345 | 248 | 10 | |
| A | 393 | 231 | 10 | |
| N | 344 | 279 | 22 | |
| 1025 | CW | 448 | 317 | – |
| SR | 379 | 283 | 10 | |
| A | 407 | 365 | 15 | |
| N | 348 | 279 | 22 | |
| 4130 | SR | 586 | 424 | 10 |
| A | 479 | 317 | 10 | |
| N | 514 | 321 | 10 | |
| 4140 | SR | 589 | 355 | 10 |
| A | 514 | 352 | 15 | |
| N | 521 | 355 | 10 |
Hollow bar OD tolerance is typically in the plus range, while ID tolerance is in the minus range. Wall thickness variation is influenced by eccentricity.
In contrast, ASTM A511 mechanical tubing tolerances are centered. Machining setups should account for these differences, typically centering on the OD.
Size range:
OD: 1.375" – 7.750"
Wall thickness: 0.188" – 1.625"
| Standard | Description |
|---|---|
| ASTM A511 | Seamless Stainless Steel Mechanical Tubing |
| ASTM A512 | Cold-Drawn Buttweld Carbon Steel Mechanical Tubing |
| ASTM A513 | ERW Carbon & Alloy Steel Mechanical Tubing |
| ASTM A519 | Seamless Carbon & Alloy Steel Mechanical Tubing |
| ASTM A554 | Welded Stainless Steel Mechanical Tubing |
SCM4 grade seamless steel pipes find applications in diverse industries, including machinery manufacturing, construction, and engineering. Their high-quality construction and reliability make them a preferred choice for various industrial applications.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.
