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GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib

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GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib

MOQ:	1 Tons
Price:	800-1000 USD/Tons
Standard Packaging:	In bundles or in wooden boxes.
Delivery Period:	20-30days upon products
Payment Method:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Capacity:	60000 Ton/Tons per Year

Details Information

Product Description

Detail Information

Place of Origin

Zhejiang/China

Brand Name

TORICH

Certification

ISO9001, ISO14001, TS16949

Model Number

GB 30584

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

Product Description

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 0

GB 30584 BJ450 Seamless Steel Pipes for Crane Jib Hydraulic Cylinder Structures

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%.

Specifications

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

Main Characteristics

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

Our Advantages

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.

Execution Standards

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

Application Field

Crane jib hydraulic luffing cylinder barrel for mobile crane boom lifting systems.

Chemical Composition

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.

Mechanical Properties

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	—

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 1

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 2

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 4

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 6

TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and

trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and

credibility among domestic and foreign customers.

The company's production plant covers an area of over 10,000 square meters, with an annual production

capacity of 50,000 tons of materials and a comprehensive trading and warehousing capacity of 100,000 tons, which can satisfy customers' personalized needs for raw materials in terms of diversity and timeliness.

The group holds shares in more than ten domestic production entities, whose main products include

seamless steel pipes ( carbon steel and stainless steel), welded pipes ( carbon steel and stainless steel), pipe fittings ( carbon steel and stainless steel), titanium (titanium tubes, titanium rods, titanium cakes, titanium plates, etc.), aluminum (aluminum tubes, aluminum rods, aluminum die casting, aluminum casting, CNC machining), and CNC deep processing of metal materials such as tubes, rods, and casting parts.

Over the past 30 years, the company has been gradually developing new technologies and materials to meet

the growing needs of customers and various diversified needs, exporting to more than 56 countries and still

increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.

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, it is 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<=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.

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GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib

MOQ:	1 Tons
Price:	800-1000 USD/Tons
Standard Packaging:	In bundles or in wooden boxes.
Delivery Period:	20-30days upon products
Payment Method:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Capacity:	60000 Ton/Tons per Year

Detail Information

Product Description

Detail Information

Place of Origin

Zhejiang/China

Brand Name

TORICH

Certification

ISO9001, ISO14001, TS16949

Model Number

GB 30584

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

Minimum Order Quantity:

1 Tons

Price:

800-1000 USD/Tons

Packaging Details:

In bundles or in wooden boxes.

Delivery Time:

20-30days upon products

Payment Terms:

L/C, D/A, D/P, T/T, Western Union, MoneyGram

Supply Ability:

60000 Ton/Tons per Year

Product Description

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 0

GB 30584 BJ450 Seamless Steel Pipes for Crane Jib Hydraulic Cylinder Structures

Specifications

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

Main Characteristics

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

Our Advantages

Execution Standards

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

Application Field

Crane jib hydraulic luffing cylinder barrel for mobile crane boom lifting systems.

Chemical Composition

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.

Mechanical Properties

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	—

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 1

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 2

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 4

GB 30584 BJ450 Hydraulic Cylinder Seamless Steel Pipes For Crane Jib 6

TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and

trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and

credibility among domestic and foreign customers.

The company's production plant covers an area of over 10,000 square meters, with an annual production

The group holds shares in more than ten domestic production entities, whose main products include

Over the past 30 years, the company has been gradually developing new technologies and materials to meet

the growing needs of customers and various diversified needs, exporting to more than 56 countries and still

increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.

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, it is 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<=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.

Tags: