A brief introduction to Check Valve

 Size range:2''-36'' inches

Pressure: PN10/PN16/ 125PSI/150PSI

Working dimensions: DN50-DN600

Material:

The body material: DI/ CI/ Cast steel

The seat material: Rubber/ bronze/brass

Standard:

DIN3202-F1, ANSI, BS4504

DIN/BS/EN/API600/Russian Standard , ANSI Y-Strainer

Application:

Check valve is suitable for the transportation of Water, Steam, Oil etc.

Coating: FBE Powder Coating or Akzo Nobel Powder Coating, per customer’s requirement

For more info about Check Valve, feel free contact us anytime.

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Method of galvanizing seamless pipe

 There are two types of galvanizing methods for seamless tubes: hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing includes wet method, dry method, lead-zinc method, redox method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the surface of the pipe body after acid dip cleaning of the steel pipe to improve the quality of galvanizing. The dry method and redox method are mainly used in the production.

1. Hot-dip galvanized seamless tube

The hot-dip galvanized seamless tube is made by reacting the molten metal with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in the tank of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the in the hot dip bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. It is widely used in gas pipelines, natural gas pipelines, heating pipeline systems, and some outer wires of galvanized steel pipes are also used in hot water pipe network systems and domestic drainage systems.

2. Cold galvanized seamless tube

Cold galvanizing is electro-galvanizing. The amount of galvanizing is very small, only 10-50g/m2. Its corrosion resistance is much different than that of hot-dip galvanized pipes. In order to ensure the quality, most regular galvanized pipe manufacturers do not use electro-galvanized (cold plating). Only those small enterprises with outdated equipment use electrogalvanizing, and of course their prices are relatively cheap. At present, cold galvanized pipes have been banned from being used as water and gas pipes.

3. The difference between hot and cold galvanized tubes

Hot-dip galvanized seamless tube: complex physical and chemical reactions occur between the steel pipe matrix and the molten plating solution to form a corrosion-resistant zinc-iron alloy layer with a tight structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.

Cold galvanized seamless tube: The zinc layer is an electroplating layer, and the zinc layer is independently layered with the steel pipe substrate. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe substrate and is easy to fall off. Therefore, its corrosion resistance is poor. In newly built houses, it is forbidden to use cold galvanized steel tubes as water supply pipes.

https://www.xysteelpipe.com/method-of-galvanizing-seamless-pipe/

A brief introduction to Ball Valve

 Size range and Pressure:

ANSI Ball Valve: SIZE 1/2"~48" , Class150- Class 250

BS Ball Valve: DN50 -DN350, PN16~PN40

DIN Ball Valve: DN50-DN600, PN16~PN160

JIS Ball Valve: DN50-DN600 10K~63K

Specification:

EN1092-2 PN10/PN16/PN25, ANSI B16.1 Class125, ANSI B16.2 Class250, BS10 Table D/E, JIS 10K/16K

Application:

Water, Oil, Gas, corrosive liquid usage

For more info about Ball Valve, feel free contact us anytime.

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A brief introduction to Butterfly Valve

Size range: 2 to 48 inches (DN50 to DN1200)

Pressure:

PN10-PN16 /Class 125, Class150

Specification:

EN1092-2 PN10/PN16/PN25, ANSI B16.1 Class125, ANSI B16.2 Class250, BS10 Table D/E, JIS 10K/16K

Application:

Water, Oil, Gas, corrosive liquid usage

For more info about Butterfly Valve, feel free contact us anytime.

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A brief introduction to gate valve

 Size range: 2 to 40 inches (DN40 to DN1000)

Specification:

ASME B16.10, BS5163, DIN3202 F4, DIN3202 F5, BS EN558-1

Pressure: PN10/PN16/PN25, Class125 to Class250

Body and bonnet Material :

GG25 / GGG40; ASTM A126 ClassB, HT250; ASTM A536 65-45-12, 550-7;

Suitable for : Water, oil and gas application

For more info about gate valve, feel free contact us anytime.

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A brief introduction to WN Flange

 WN flange, which is short for weld neck flange, is widely used for oil and gas field, offshore construction, water supply system, shipment building, power station, pipeline project, etc.

Size range: 1/2 to 56 inches (DN15 to DN1400)

Pressure: ANSI class 150 to 2,500

Materials: carbon steel, stainless steel, alloy steel

Standards: API, ANSI, BS, JIS, UNI, MSS and SP

Steel specification:

ASTM A105

ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2

ASTM A516.60

ASTM A694 (F42, F46, F48, F50, F52, F56, F60, F65, F70)

ASTM A182 F304/304L, F316/316L, F316H, F310, F321

ASTM A182 F11, F22,

For more info about weld neck flange, feel free contact us anytime.

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A brief introduction to RF Flange

 Size range: 1/2"- 56" inches

Materials: carbon steel, stainless steel, alloy steel

Standard and steel grade:

ANSI B16.5 Class150 , Class300, Class600, Class900

BS4504, PN10, PN25, PN40

DIN2576, PN10, PN25, PN40

JIS 5K 10K 16K 40K

ASTM A105, C22.8, ST37.2, SS304, 304L , SS316, 316L

For more info about socket welding flange, feel free contact us anytime.

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Measures to improve the accuracy of seamless pipe wall thickness

 The control of the wall thickness of the steel pipe is a difficult point in the production of the steel pipe. The measures to improve the accuracy of the wall thickness of the seamless tube in the production mainly include the following aspects:

1. Tube billet heating

The heating should be uniform, and it is forbidden to rapidly increase or decrease the temperature. Each time the temperature rise and fall should be kept steady and slow, and the maximum rise and fall temperature should not exceed 30℃.

2. Centering roller

Determine whether the centering roll is installed in place, adjust the center, opening angle and opening size of each action of the relevant core roll to be consistent, and the center of the core roll should be on the rolling line.

3. Rolling center line

Ensure that the rolling center line of the piercing machine is consistent with the center line of the piercing trolley, and avoid “up rolling” or “down rolling”, so that the tube blank can be uniformly stressed during piercing.

4. Rolling tools

For the worn plugs, guide plates, rolls and other rolling tools, they should be replaced in time.

5. Installation of rolling tools

The center of roll distance and lead distance must be on the rolling line. Ensure that the center line of the lead distance and the roll distance is on the center line of the piercing and rolling, that is, the upper and lower roll distances are equal, and the left and right lead distances are equal.

6. Perforated ejector

The perforated ejector rod is generally selected as a thick-walled pipe with an outer diameter of Φ108mm-Φ114mm, a wall thickness of ≥25mm and a uniform wall thickness.

7. Rolling mandrel

The mandrel should be processed by a thick-walled tube with a thicker wall. For a mandrel with a smaller size, a solid billet can be used instead. Thick-walled pipes and solid billets with uniform wall thickness can greatly reduce the probability of bending deformation of the mandrel, and can effectively improve the wall thickness accuracy of the steel pipe.

8. The accuracy of the mandrel

The length and slenderness of the mandrel is relatively large. Generally, the outer diameter is first turned and then the opening is welded, or the long material is directly turned and formed. The external machining accuracy of the mandrel is controlled within ±0.1mm, and the straightness deviation of the mandrel does not exceed 5mm. When welding, a precision-machined pin is inserted between the two mandrels for positioning to prevent excessive deviation of the overall straightness caused by welding.

9. Improve the craftsmanship

Improve the process to prevent the thinning in the middle and the increase of the wall thickness from exceeding the control range, and improve the accuracy of the wall thickness.

https://www.xysteelpipe.com/measures-to-improve-the-accuracy-of-seamless-pipe-wall-thickness/

A brief introduction to Socket Welding Flange

 Socket Welding Flange (SWRF)

Materials: Carbon Steel, Stainless Steel, Alloy Steel

Size range? 1/2 to 64inches (DN15 to DN1,600mm)

Pressure: ANSI class 150 to 2,500

Application: Oil field, water supply system, offshore construction, ship building, natural gas pipeline fitting, pipe project, electric power, etc.

Standards:

API, ANSI, BS, JIS, UNI, MSS and SP

Steel Grades:

ASTM A105

A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2

A516.60

A694 (F42, F46, F48, F50, F52, F56, F60, F65, F70)

A182 F304/304L, F316/316L, F316H, F310, F321

A182 F11, F22,

For more info about socket welding flange, feel free contact us anytime.

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A brief introduction to Plate Flange

 Carbon steel Plate Flange, stainless steel Plate Flange, alloy steel Plate Flange.

Size range: 1/2"- 56"

Standard specification:

ANSI B16.5 Class150 , Class300, Class600, Class900

BS4504, PN10, PN25, PN40

DIN2576, PN10, PN25, PN40

JIS 5K 10K 16K 40K

ASTM A105, C22.8, ST37.2, SS304, 304L , SS316, 316L

http://www.tjxysteel.com/news/A-brief-introduction-to-Plate-Flange-250.html

A brief introduction to Thread Flange

 Thread Flange, Screw Flange, NPT Flange

Size range: 1/2 to 6 inches (DN 15 to DN 150)

Pressure range: ANSI class 150 to 600

Surface Treatment: Black Coating, Color Coating, Hot Dipped Galvanized, or per customer

Standard: ANSI B16.5, BS4504, EN1092-1, DIN

Materials:

ASTM A105, A350 LF2 (CS)

ASTM A182 F304/304L, F316/316L, F316H, F310, F321 (SS)

ASTM A182 F11, F22 (AS)

For more info about carbon, stainless steel, and alloy thread flange, you can contact Xinyue online directly, our send your questions to Contact Us---Email. We’ll be at your service.

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Flattening test of seamless steel pipe

 The production process of seamless steel pipes is relatively cumbersome and rigorous. After the seamless steel pipe is produced, certain tests must be carried out. Do you know the flattening test method and steps of the seamless steel pipe?

1) Flatten the sample:

1. The sample is cut from any part of the seamless steel pipe that has passed the visual inspection, and the sample should be the full-face pipe section of the pipe product.

2. The length of the sample should not be less than 10mm, but not more than 100mm. The edges of the specimen may be rounded or chamfered by filing or other methods. Note: If the test results meet the test requirements, the edges of the sample may not be rounded or chamfered.

3. If it is to be carried out on the end of a full-length tube. During the test, the incision shall be made perpendicular to the longitudinal axis of the pipe at the length of the sample from the end face of the pipe, and the cutting depth shall be at least 80% of the outer diameter.

2) Test equipment:

The test can be carried out on a universal testing machine or a pressure testing machine. The testing machine shall be equipped with two upper and lower parallel platens, and the width of the parallel platens shall exceed the width of the flattened sample, that is, at least 1.6D. The length of the pressing plate is not less than the length of the sample. The testing machine has the ability to flatten the sample to a specified pressure value. The platen should have sufficient stiffness and be able to control the speed range required for the test.

3) Test conditions and operating procedures:

1. The test should generally be carried out in the room temperature range of 10°C ~ 35°C. For tests requiring controlled conditions, the test temperature shall be 23°C ± 5°C. The flattening speed of the sample can be

20-50mm/min. When there is a dispute, the moving speed of the platen should not exceed 25mm/min.

2. According to the relevant standards, or the agreement between the two parties, the distance H of the platen should be determined.

3. Place the sample between two parallel platens. The welds of welded pipes should be placed in the positions specified in the relevant products and standards. Use a press or a testing machine to apply a force in the radial direction, and at a speed of not more than 50mm/min, evenly press to the flattening distance H, remove the load, remove the sample, and visually observe the bending part of the sample.

Precautions:

During the flattening test, the flattening distance H shall be measured under load. In the case of closed flattening, the width of the contact between the inner surfaces of the sample should be at least 1/2 of the inner width b of the standard sample after flattening.

The flattening performance test of seamless steel pipe plays an important role in the hardness, melting point, corrosion resistance and pressure of seamless steel pipe, and this test should be done well.

https://www.xysteelpipe.com/flattening-test-of-seamless-steel-pipe/

Galvanizing process of square and rectangular tubes

 A) What are the two galvanizing processes for square and rectangular tubes?

Galvanized square tube, also known as galvanized square tube, is a square tube that has been galvanized. According to different production processes, galvanized square tube can be divided into two types: hot-dip galvanized square tube and cold-galvanized square tube:

1. Hot-dip galvanized square tube

It is a galvanized square tube formed after a series of chemical reactions by placing the square tube in a hot-dip galvanizing bath after being crimped and formed by a steel plate or a steel strip. There are many kinds of hot-dip galvanizing methods, such as wet method, dry method, lead-zinc method, redox method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the surface of the pipe body to improve the quality of galvanizing after the steel pipe is acid dipped and cleaned. In the production, dry method and redox method are mainly used.

2. Cold galvanized square tube

Also known as electro-galvanized square pipe, it is to put the made square pipe into the electrolyte, the liquid contains zinc, after electrification, the electroplating operation is carried out, and the zinc powder or galvanized coating and the steel of the square pipe are fully contact to form a galvanized layer.

B) What is the difference between hot dip galvanized square pipe and cold galvanized square pipe?

The main difference between hot-dip galvanized square pipe and cold-dip galvanized square pipe lies in the different production processes. In addition, there are also certain differences in appearance, use, price, etc.

1. Different appearance

The appearance of the cold galvanized square tube is relatively smooth and bright.

The angle is slightly colorful; the appearance of the hot-dip galvanized square pipe is slightly rougher than the cold-galvanized square pipe, and it is silver-white, and the appearance is prone to process water lines and a little dripping tumor, especially in the process of production.

One end of the piece is more obvious.

2. Different anti-corrosion properties

Compared with hot-dip galvanized pipe, cold-dip galvanized pipe has worse corrosion resistance, and the corrosion resistance of hot-dip galvanized pipe is dozens of times that of cold-dip galvanized pipe.

3. Different uses

Hot-dip galvanized square and rectangular pipes are mainly used in curtain walls, construction, machinery manufacturing, solar power generation brackets, steel structure projects, etc., especially in curtain walls and buildings, which are widely used;

Cold galvanized square tube is characterized by high strength and light structure, and is mainly used in general occasions.

4. Different prices

Under the same thickness and size, the price of hot-dip galvanizing is more expensive than that of cold-galvanizing. This is because the cold-galvanized square tube only needs to be plated on one surface, and the whole square tube must be plated with respect to the hot-dip galvanized square tube.For galvanizing, the production cost is naturally lower.Of course, although the difference between the hot-dip galvanized square tube and the cold-dip galvanized square tube is relatively large, there is actually no difference between the two, and the appropriate square tube can be selected mainly according to the actual needs.

https://www.xysteelpipe.com/galvanizing-process-of-square-and-rectangular-tubes/

A brief introduction to RTJ Blind Flange

 RTJ blind flange, which is short for ring-type joint blind flanges, is widely applied in oil field, water system, offshore construction, ship manufacturing, sewage treatment, natural gas pipeline system, power plant, etc.

Xinyue can provide size range form 1/2” to 56”, DN 15 to 1400. Pressure of ANSI class is from 150 to 2500.

Most common seen standard is API, ANSI, BS, JIS, UNI, DIN, EN1092-1.

Most common seen material are as below:

ASTM A105

ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2

ASTM A516.60

ASTM A694 (F42, F46, F48, F50, F52, F56, F60, F65, F70)

ASTM A182 F304/304L, F316/316L, F316H, F310, F321

ASTM A182 F11, F22

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Do you really know about Flange?

 Flange can be devided into many kinds, today we’ll talk about the classification of flanges.

Most common seen flange are as below:

1. RTJ Blind Flange

2. WN Flange

3. RF Flanges

4. Thread Flange

5. Plate Flange

6. Socket Welding Flange

7. Slip on Flange

8. Spade flange & Spacer ring Flange

9. Orifice Welded Neck Flanges

Xinyue Steel Group can provide all above flanges, size range of flange is from 2” to 96”, and we can manufacture carbon flange, stainless flange and alloy flange. For more info about flange, you can contact Xinyue anytime, we’ll provide more professional info for you online.

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