TORICH INTERNATIONAL LIMITED
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products |
| Packaging Details | In bundles or in wooden boxes. |
| Material | Carbon steel seamless pipe |
| Standard | GB 30584 |
| Grade | BJ450 |
| Manufacturing Route | Hot rolled or cold drawn seamless |
| Outside Diameter | 32–219 mm according to listed GB 30584 range |
| Wall Thickness | 3–45 mm according to listed GB 30584 range |
| Length | 1–12 m customizable; special lengths up to 18 m by agreement |
| Heat Treatment | Heat treated delivery condition; stress relieved or normalized condition available by agreement |
| Brand Name | TORICH |
| Model Number | GB 30584 |
| Certification | ISO9001, ISO14001, TS16949 |
| Place of Origin | Zhejiang/China |
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Product Specification
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram | Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products | Packaging Details | In bundles or in wooden boxes. |
| Material | Carbon steel seamless pipe | Standard | GB 30584 |
| Grade | BJ450 | Manufacturing Route | Hot rolled or cold drawn seamless |
| Outside Diameter | 32–219 mm according to listed GB 30584 range | Wall Thickness | 3–45 mm according to listed GB 30584 range |
| Length | 1–12 m customizable; special lengths up to 18 m by agreement | Heat Treatment | Heat treated delivery condition; stress relieved or normalized condition available by agreement |
| Brand Name | TORICH | Model Number | GB 30584 |
| Certification | ISO9001, ISO14001, TS16949 | Place of Origin | Zhejiang/China |
GB 30584 BJ450 seamless steel pipes are designed for crane jib structural members and hydraulic lifting assemblies where weld-free tube integrity, stable wall thickness, controlled straightness, and reliable forming performance are required. GB 30584 covers seamless steel tubes for crane jib applications, including dimensional requirements, technical requirements, inspection rules, marking, packaging, and quality certificates. BJ450 is a carbon steel grade with minimum tensile strength of 353 MPa, minimum yield strength of 216 MPa, and minimum elongation of 24%.
| Item | Description |
|---|---|
| Material | Carbon steel seamless pipe |
| Standard | GB 30584 |
| Grade | BJ450 |
| Manufacturing Route | Hot rolled or cold drawn seamless |
| Outside Diameter | 32–219 mm according to listed GB 30584 range |
| Wall Thickness | 3–45 mm according to listed GB 30584 range |
| Length | 1–12 m customizable; special lengths up to 18 m by agreement |
| OD Tolerance | 32–50 mm: ±0.5 mm; 51–219 mm: ±1% |
| Wall Thickness Tolerance | 3–15 mm: +12.5 / -15%; 16–30 mm: ±12.5%; 32–45 mm: +10 / -12.5% |
| Straightness | 0.2–0.5 mm / 1000 mm for precision hydraulic-cylinder tube processing reference |
| Surface Condition | Bare, oiled, shot-blasted, phosphate, black painted, or customized anti-rust protection |
| Heat Treatment | Heat treated delivery condition; stress relieved or normalized condition available by agreement |
| Inspection | Chemical analysis, tensile test, elongation test, hardness test, flattening test, bending test, flaring test, NDT, surface inspection, and dimensional check |
| Characteristic | Technical Value |
|---|---|
| Seamless Body Integrity | No longitudinal weld seam, suitable for crane jib load-bearing tube sections |
| BJ450 Strength Level | Tensile strength ≥353 MPa; yield strength ≥216 MPa; elongation ≥24% |
| Carbon Range | C 0.07–0.14%, supporting weldability and forming stability |
| Dimensional Control | OD tolerance ±0.5 mm for 32–50 mm; ±1% for 51–219 mm |
| Wall Control | Controlled WT tolerance from +12.5 / -15% to ±12.5% depending on thickness range |
| Hydraulic-Cylinder Processing Suitability | Can be supplied for subsequent boring, honing, skiving, roller burnishing, machining, and welding assembly |
| Crane Jib Use | Suitable for crane boom / jib structures requiring dimensional stability and verified mechanical properties |
1. Controlled fatigue-risk management for crane lifting cycles
Hydraulic cylinder and crane applications are exposed to repeated loading, machining cycles, and low-temperature working conditions. Industry hydraulic-cylinder tube references emphasize high fatigue life, strength, toughness, and structural integrity during repeated cycles. We control steelmaking, seamless rolling or cold drawing, heat treatment, and NDT to reduce tube-body defects before machining.
2. Machining-ready dimensional consistency
Professional buyers normally care about ID/OD consistency, straightness, wall eccentricity, and surface condition because these factors affect honing allowance, seal life, and assembly time. Hydraulic cylinder tube references list cold drawn ID ranges of 16–220 mm, straightness of 0.2–0.5 mm / 1000 mm, and roughness targets such as Ra 0.8–1.6 μm for cold drawn tubes and ≤0.4 μm for skived and roller burnished tubes.
3. Inspection package aligned with export procurement
For crane jib seamless pipes, GB 30584-related supply information includes chemical composition testing, tensile and elongation testing, hardness, flattening, bending, flaring, NDT, surface inspection, dimensional checking, marking, packaging, and quality certificate requirements. This supports traceability for crane OEMs, hydraulic cylinder manufacturers, and heavy equipment maintenance buyers.
| Standard System | Reference Standard | Scope |
|---|---|---|
| GB | GB 30584 | Seamless steel tubes for crane jib |
| GB | GB/T 3639 | Cold drawn or cold rolled precision seamless steel tubes |
| ASTM | ASTM A519 | Seamless carbon and alloy steel mechanical tubing |
| EN | EN 10305-1 | Seamless cold drawn precision steel tubes |
| EN | EN 10210-1 / EN 10297-1 | Structural hollow sections / seamless circular steel tubes for mechanical and engineering use |
| JIS | JIS G3441 | Alloy steel tubes for machine structural purposes |
| GOST | GOST 8732 / GOST 8734 | Hot-worked and cold-worked seamless steel pipes |
Crane jib hydraulic luffing cylinder barrel for mobile crane boom lifting systems.
| Grade | Standard / Reference | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Cu % | V % | Al % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BJ450 | GB 30584 | 0.07–0.14 | 0.17–0.37 | 0.35–0.65 | ≤0.035 | ≤0.040 | ≤0.15 | ≤0.30 | ≤0.30 | — | — |
| 20# | Hydraulic cylinder tube reference | 0.17–0.23 | 0.17–0.37 | 0.35–0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | — | — |
| 45# | Hydraulic cylinder tube reference | 0.42–0.50 | 0.17–0.37 | 0.50–0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | — | — |
| Q355B | Hydraulic cylinder tube reference | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.15 | — |
| 25Mn | Hydraulic cylinder tube reference | 0.22–0.29 | 0.17–0.37 | 0.70–1.00 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | — | — |
BJ450 chemistry is from GB 30584-related data, while 20#, 45#, Q355B, and 25Mn are commonly supplied hydraulic cylinder tube grades used as comparable material options.
| Grade | Delivery Condition | Tensile Strength MPa | Yield Strength MPa | Elongation % | Impact |
|---|---|---|---|---|---|
| BJ450 | Heat treated | ≥353 | ≥216 | ≥24 | By agreement |
| 20# / 1020 / E255 / ST45 | +SR / BKS | ≥580 | ≥480 | ≥15 | — |
| 45# / 1045 | +SR / BKS | ≥630 | ≥520 | ≥12 | — |
| Q355B | +SR / BKS | ≥620 | ≥520 | ≥15 | — |
| 25Mn / 1026 | +SR / BKS | ≥620 | ≥510 | ≥15 | — |
A: manufacturer,also can do trading.
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, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company,Seller
Year Established:
1997
Total Annual:
10million-15million
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Who We are ？ TORICH is an enterprise that has been producing precision steel pipes and steel pipe processing for over 20 years, with a factory area of approximately 20000 square meters The main products produced are carbon steel and alloy steel grade seamless steel pipes, we... Who We are ？ TORICH is an enterprise that has been producing precision steel pipes and steel pipe processing for over 20 years, with a factory area of approximately 20000 square meters The main products produced are carbon steel and alloy steel grade seamless steel pipes, we...
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