GB/T5312 seamless steel tube for ships

GB/T5312 seamless steel pipe for ships

Delivery Time: 7-15days after pre-payment


Trade Terms: FOB ,CIF, CFR

Payment: L/C,D/A,D/P,T/T,Western Union,Money Gram payments for offline orders.

Mobile/whatsapp/wechat: +86-15076763716




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GB/T5312 seamless steel pipe for ships  is widely used for Marine boiler and superheater and Ⅰ, Ⅱ pressure piping with seamless steel tube manufacturing. This kinds of steel pipe is made by material of 320/360/410/460/490 according to the GB/T 5312 standard.


TYPE Outer Diameter Wall Thickness
Cold-drawn pipe OD(mm) Tolerance(mm) OD(mm) Tolerance(mm)
>30~50 ±0.3 ≤30 ±10%
>50~219 ±0.8%
Hot -rolled pipe >219 ±1.0% >20 ±10%
Material: 320/360/410/460/490
packaging Details
1. Small OD: In hexagonal bundle with steel strips
2. Large OD: In bulk
3. Wrapped in waterproof plastic woven bag
4. Filled in wooden cases
Shipment:1.length:≤5.8m loaded in 20FT Container with 25-27tons
2.length:≤11.8m loaded in 40FT Container with 25-27tonsTrade Terms: FOB / CIF / CFRPayment Terms: LC TTLoading Port: Xingang Tianjin,China


Chemical Composition

GB/T5312 seamless steel pipe for ships
Standard Grade  chemical composition(%)
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

Mechanical Property

GB/T5312 seamless steel pipe for ships
Standard Grade  chemical composition(%)
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


Our Company

Cangzhou Zhongshun Steel Pipe Trade Co.,Ltd is a large-scale materials circulation enterprises. To achieve one-step service,we are working together to achieve the strategic partner with a number of companies. The mainly product: welded steel pipe,spiral steel pipe,seamless steel pipe,square steel pipe ,galvanized steel pipe,elbow,flange and so on.
Our company keeps the principle of integrity-based,customer first.Thank new and old customers by the best quality, lowest price,the most perfect after-sales service!

1.About us

We located in CangZhou,where be known for steel pipes.

We are working in steel pipes and export trade for more than 9years.

We have donzens of production lines.

2.Main business

We focus on kinds of steel pipe, such as welded steel pipe, galvanized steel

pipe, square&rectangular steel pipe, seamless steel pipe, elbow ,tee  flange,etc.

3.Supply ability

About 20000 tons/per month.

Large capacity of stock could ensure our short lead time.


Our products have been manufactured according to API, ASTM, EN, BS, ISO, DIN and JIS internationally advanced standards.



Pls contact me


CangZhou ZhongShun Steel Pipe Trade CO., LTD

Add: Cangzhou Custom House Building,Cangzhou City,

Hebei Province,China

whatsapp: +86-15076763716


Global Business

1. More than 10 years of sales experience

2. Product exported more than 150 countries

3. Arrange to produce according yo customer's request

Fast Delivery

1. AA level customs broker,Faster through

2. 20 years of experience in the freight forwarding company

3. Delivery Detail: 10-20 days

Trusted Quality

1. Certificate: API, CE, ISO9001.2000.MTC etc

2. Inspection: BV,SGS,others is avaliable.

3. A complete testing system and testing equipments

One-Step Service

1. Free sample can be provided

2. Small order is acceptable

3. OEM is acceptable

4. Any third party testing is acceptable




  • Phone0086-317-2159105


  • Phone0086-317-2159106