Seamless steel tubes for ships

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Product Description:

Standards:
Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
Standard of DNV Det Norske Veritas(DNV)
Standard of Lloyd’S Register of UK(LR) Lloyd’S Register of UK(LR)Standard of Germanischer Lloyd Germanischer Lloyd(GL)
Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
Standard of RINA Italian classification society(RINA)
Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)
GB/T5312 Chinese national standard
Appication:
Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ.
Model N0.of major steel tubes
320,360,410,460,490,etc.

Types of steel tubes

Outer diameters

wall thickness

Cold-rolled tubes

Rube size(mm)

tolerances(mm)

Tube sizes (mm)

Tolerances(mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

Hot-rolled tubes

>219

±1.0%

>20

±10%

Mechanocal properties:

Standard code

Models of steel tubes

Tensile strength(MPa)

Yield strength(MPa)

Elongation(%)

GB/T5312

320

320~410

≥195

≥25

360

360~480

≥215

≥24

410

410~530

≥235

≥22

460

460~580

≥265

≥21

490

490~610

≥285

≥21

Chemical compisition:

Standard code

Models of steel tubes

Chemical compisition(%)

C

Si

Mn

P

S

GB/T5312

320

≤0.16

≤0.35

0.40~0.70

≤0.035

≤0.035

360

≤0.17

≤0.35

0.40~0.80

≤0.035

≤0.035

410

≤0.21

≤0.35

0.40~1.20

≤0.035

≤0.035

460

≤0.22

≤0.35

0.80~1.40

≤0.035

≤0.030

490

≤0.23

≤0.35

0.80~1.50

≤0.035

≤0.030

Note:residual elements:Cr≤0.25%,Mo≤0.10%,Ni≤0.30%,Cu≤0.30%aggregate≤0.70%


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Q:What is a tight steel tube?
JDG pipe is the replacement of traditional PVC and SC pipes and other traditional wire conduits. It is a breakthrough in the field of building electrical field using new materials and technologies. The JDG pipe adopts the cross connecting ground wire of galvanized steel pipe and thin-wall steel pipe, overcomes the defects of complicated construction and large construction loss of common metal pipe, and solves the problems of poor fire resistance and difficult grounding of PVC pipe. Because the JDG pipe material is more expensive than the ordinary pipe material, it is more used in the construction, such as comprehensive wiring, fire protection wiring and so on.
Q:How much is the tube?
The first prerequisite we need to determine is: what are the specifications of the steel pipe mentioned? Such as the commonly used steel pipe specifications: diameter 108*4.5, diameter 219*6, diameter 377*10, diameter and wall thickness of steel pipe with different specifications, different weight, so the steel price per meter is different.
Q:Is it good to buy a simple wardrobe or a steel pipe?
Natural nobility, if the quality and the degree of firmness, is the simple steel cloth cabinet is the best. However, because the texture of wood wardrobe, solid wood wood may be used after deformation.
Q:20# seamless steel pipe and seamless steel pipe 20G what is the difference?
20G seamless steel tube is a high-pressure boiler tube. In addition to carbon content, 20G seamless steel tubes also have some trace elements that are more suitable for use as boiler pressure vessels. In addition, 20G also focuses on its physical performance. Such as bending, impact and tensile properties. 0G seamless steel tube is a kind of steel strip with hollow section and without seams. A steel pipe having a hollow cross section, used as a conduit for conveying fluids, such as pipelines for transporting petroleum, natural gas, gas, water, and certain solid materials.
Q:Heating system DN40 and DN32 welded steel pipe how to connect?
Welding: AC arc welding machine welding. Mode 1: apply to the medium of non demanding piping, DN40 steel pipe necking and DN32 steel pipe butt welding, or directly DN32 steel pipe into the DN40 internal welding. 2: the pipeline requirements apply to the inner wall of smooth transition, reducing short circuit welding for DN40x32 suppression of this mechanism are used for connection pipe seamless steel pipe high pressure pipeline connection, no special requirements, not commonly used welded steel pipe. Connection of mechanism fittings is not only costly, but not necessary unless special requirements are required!
Q:What are low-pressure carbon steel tubes?
Any of various steels that contain less than 2.11% of the mass of carbon but contain no alloying elements. Sometimes referred to as plain carbon steel or carbon steel.Carbon steel, in addition to carbon, usually contains a small amount of silicon, manganese, sulfur and phosphorus.1) according to the use of carbon steel can be divided into carbon structural steel, carbon tool steel and easy to cut structural steel three categories, carbon structural steel is divided into engineering construction steel and machine manufacturing structural steel two kinds;(2) by refining methods can be divided into open hearth steel, converter steel;(3) according to deoxidization methods, they can be divided into boiling steel (F), killed steel (Z), semi killed steel (b) and special killed steel (TZ);(4) according to the carbon content of the steel can be divided into low carbon steel (WC = 0.25%), carbon steel (WC0.25% - 0.6%) and high carbon steel (WC>0.6%);(5) according to the quality of steel, carbon steel can be divided into ordinary carbon steel (phosphorus, sulfur, higher), high quality carbon steel (low phosphorus and sulfur) and high quality steel (lower phosphorus and sulfur) and super quality steel.Description: the carbon content in general carbon steel is higher, the hardness is higher, the strength is higher, but the plasticity is lower.
Q:Galvanized steel pipe, PPR pipe, PE pipe, U-PVC pipe and HDPE double wall corrugated pipe and what is the difference between the characteristics of
Galvanized steel pipe is a kind of antirust steel pipe, often used in relatively high water supply pipeline or hot water pipeline, the price is higher, can use for at least 30 years;PPR pipe is a kind of polypropylene plastic, which is commonly used in environmental protection plastic pipes, but only suitable for low temperature occasions. It is mainly used for water supply;
Q:What are the advantages of PVC pipe and galvanized steel pipe?
Galvanized steel pipe is also used, because some areas require the use of strength. Moreover, the iron and steel industry is a pillar industry, there are some unspoken rules in it.
Q:Is the PVC tube a plastic tube or a plastic tube?.
Or polymer polymerized by radical polymerization under the action of light and heat. The vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resins. The material is a non crystalline material. PVC materials often use stabilizers, lubricants, auxiliary processing agents, pigments, anti shock agents and other additives in practical use. Is not flammable, high strength, excellent resistance to climate variability and geometric stability. PVC has strong resistance to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, and it is also not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.
Q:How to make the internal tooth of the steel pipe?
Cylindrical thread can be used, if the tube is too long, you may consider a short tube with thread, and then welded to the long tube.Taper thread is more difficult to use than ordinary vehicle, and the tap is generally considered. The tap can be clamped on the tailstock.

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