What are the requirements for stainless steel pipes for bathroom use?

The stainless steel pipe installed in the bathroom will have some requirements on material selection, corrosion resistance, heat resistance, etc. So what are the quality requirements for these stainless steel pipes?

1. Selection of raw materials

According to the provisions of JG/T 427-2014, the stainless steel pipe materials should be 06Cr19Ni10 (S30408), 022Cr19Ni10 (S30403), 06Cr17Ni12Mo2 (S31608), 022Cr17Ni12Mo2 (S31603) specified in GB/T 20878.

2. Appearance of the product

The surface of the sanitary pipe should be free from pits, scratches, pores, burrs, sink marks, holes, cold insulation, sand holes, ripples, warping and other defects; the texture of the polished surface should be clear, consistent, and free of random lines; the color of the coating surface Uniform and consistent, no defects such as bubble sagging, falling off, paint buildup, orange peel, etc; Moreover, there should be no sharp corners, burrs, burrs and other appearance defects that may cause harm to the human body in the easily accessible parts of the human body.

3. Corrosion resistance

Most stainless steel pipes require good corrosion resistance. Due to the relatively humid environment, salt spray test will be used to observe whether the requirements are met.

4. Polishing performance

Stainless steel pipe for bathroom – handrail

Stainless steel pipes are generally polished during production. The surface of the product is clean and textured, which is very in line with the aesthetic needs of consumers. Polishing has requirements on material surface, material hardness, etc. If the surface of the material has scratches, pitting, over-pickling and other problems, it will affect the polishing performance of the product tube; the hardness of the material is too low, and it is not easy to polish when polishing, and the surface is prone to orange peel phenomenon during deep drawing, so the hardness of the material is high. , the polishing performance is relatively good.

The above are some of the requirements for stainless steel pipes for sanitary ware that Xiaobian has compiled for you. I hope it can be helpful to you. See you in the next issue!

How much is a kilogram of titanium alloy?

Titanium was originally 300,000 tons, but due to excess production in China, it was about 40,000 tons, which is 20 per kilogram! Titanium is not very valuable, but there must be a huge disparity in the price of different types of titanium alloys. A titanium alloy screw-in Bugatti is worth $50, so the nuclear price is expensive! Titanium is also difficult to machine, so the finished parts are more expensive!


There are many kinds of titanium alloys, depending on which one you want. The reference price of TC4 alloy titanium rod: 100+ yuan/kg.
The price of titanium alloy material is related to alloy composition, processing method and mechanical properties.
The price of ordinary civilian titanium alloy plates, rods and wires is 150~280 yuan/kg.
The price of military titanium alloy is generally not less than 500 yuan. High to 1300 yuan / kg.
The ingredients are almost the same, but the price is very different. The reason is high performance and stable batch quality.

Learn about the classification of stainless steel sheets

What are the classifications of stainless steel sheets? Today I will give you the answers one by one. Stainless steel plates are classified according to different standards: according to thickness: can be divided into thin plates (0.2mm-4mm), medium plates (4mm-20mm), thick plates (20mm-60mm), extra-thick plates (60-115mm) ). According to the production method, it can be divided into hot-rolled steel sheets (steel sheets heated and formed by a heating furnace) and cold-rolled steel sheets (steel sheets produced by cold rolling processes).

According to the classification, it can be divided into bridge steel plate, boiler steel plate, shipbuilding steel plate, armor steel plate, car steel plate, roofing steel plate, structural steel plate, electrical steel plate (silicon steel sheet), spring steel plate, solar panel (Hairui Special Steel). According to the arrangement and classification of steel, it can be divided into austenitic types (200 series, 300 series stainless steel).

Austenitic-ferritic type (both the characteristics of austenitic and ferritic stainless steel), ferritic type (409, 430, 434 series stainless steel), martensitic type (403, 410, 414, 416,). According to the classification of surface characteristics, it can be divided into silvery-white matt (no need for surface gloss).

Bright as a mirror (building materials, kitchen utensils), coarse grinding/intermediate grinding/fine grinding/very fine grinding (building materials, kitchen utensils), hairline grinding (buildings, building materials), close to mirroring grinding (art use, decoration used), mirror grinding (reflector, decorative).

Brief Analysis of Important Components in Titanium Pipes

Let’s analyze the working conditions of titanium fittings: Titanium pipelines mainly transport corrosive and dangerous mediums. When the medium with corrosive medium passes through titanium pipe fittings, the medium has some pressure, and the bearing pressure of each pipe fitting is different. Three commonly used pipe fittings (elbow, tee, reducer) are analyzed:

1. Reducer:

The working condition of the reducer, when the medium passes through the reducer, the medium often flows from the large end to the small end. Due to the gradual reduction of the cross-sectional area, the taper part of the reducer is pressurized, and the inner surface of the cone has a higher bearing capacity. High pressure and severe erosion-corrosion.

2. Elbow:

Elbow is one of the important pipe fittings in each pipeline system. In addition to changing the flow direction of the medium, it also increases the flexibility of the pipeline. When the medium passes through the elbow, the medium with pressure goes straight to the back of the elbow, and the medium flows along the back to the outlet. It can be seen that the back of the elbow is subjected to both high pressure and severe erosion and corrosion, indicating that its back carries more than any other part.

Three, three links:

The working condition of the tee is similar to that of the elbow. When the medium passes through the tee, it rushes to the intersection of the branch of the tee and the straight. The bearing pressure and erosion-corrosion here are greater than other parts, and the branch is in the pressure relief and diversion state of the main pipeline.

The above analysis shows that titanium pipe fittings are very important components in titanium pipes, which directly affect the life of titanium pipe fittings.

The difference between tungsten carbide-like wear-resistant welding wire and tungsten carbide

Tungsten carbide-like wire, is an inexpensive alternative to tungsten carbide alloys, with the same wear resistance as tungsten carbide alloys. The density of the tungsten carbide-like welding wire is low, and the density of the tungsten carbide alloy is high, and the wear-resistant layer of the same area and size will be used for surfacing. Material costs. At present, only Beijing Guben Technology Co., Ltd. develops and produces tungsten carbide series welding wires in China. Let’s take a look at the difference between tungsten carbide-like welding wire and tungsten carbide alloy.

1. Metallographic organization

Tungsten carbide alloy is a soft matrix that wraps large, unevenly distributed tungsten carbide particles. In actual use, the soft matrix on the surface of tungsten carbide alloy will wear out quickly, and the combination of tungsten carbide particles and the matrix will loosen, which will easily lead to tungsten carbide particles falling off and affect the overall working life of the wear-resistant layer.

Tungsten carbide-like welding wire is distributed on a solid base with a large number of fine and uniformly dispersed special carbides. Since the tungsten carbide-like is dispersed in the matrix finely and evenly, the bonding performance between the carbide particles and the matrix is ​​good, and the phenomenon of loosening and falling off will not occur, and finally the ideal wear resistance effect is obtained.

2. Number of surfacing layers

Generally, tungsten carbide alloy can only be surfacing with one layer, while tungsten carbide-like welding wire can be used for multi-layer surfacing. The multi-layer surfacing can obtain a thicker wear-resistant layer, so that the tungsten carbide-like welding wire has a longer working life than the tungsten carbide alloy, and is more suitable for severe wear conditions.

3. Welding process

The oxyacetylene welding process is used for tungsten carbide alloy, the welding position is limited, the welding speed is slow, and the welding efficiency is low. Tungsten carbide-like welding wire uses a gas shielded welding process, which can be welded in various positions, semi-automatic welding, fast speed and high efficiency.

Matters needing attention in titanium alloy processing

Pressure machining of titanium alloys is more similar to steel machining than to non-ferrous metals and alloys. Many process parameters of titanium alloys in forging, volume stamping and sheet stamping are close to those in steel processing. But there are some important features that must be paid attention to when press working Chin and Chin alloys.

Although it is generally believed that the hexagonal lattices contained in titanium and titanium alloys are less ductile when deformed, various press working methods used for other structural metals are also suitable for titanium alloys. The ratio of yield point to strength limit is one of the characteristic indicators of whether the metal can withstand plastic deformation. The larger this ratio, the worse the plasticity of the metal. For industrially pure titanium in the cooled state, the ratio is 0.72-0.87, compared to 0.6-0.65 for carbon steel and 0.4-0.5 for stainless steel.
Carry out volume stamping, free forging and other operations related to the processing of large cross-section and large size blanks in the heated state (above the =yS transition temperature). The temperature range of forging and stamping heating is between 850-1150°C. Alloys BT; M)0, BT1-0, OT4~0 and OT4-1 have satisfactory plastic deformation in the cooling state. Therefore, the parts made of these alloys are mostly made of intermediate annealed blanks without heating and stamping. When the titanium alloy is cold plastically deformed, regardless of its chemical composition and mechanical properties, the strength will be greatly improved, and the plasticity will be correspondingly reduced. For this reason, annealing treatment between processes must be performed.

The wear of the insert groove in the machining of titanium alloys is the local wear of the back and front in the direction of the depth of cut, which is often caused by the hardened layer left by the previous processing. The chemical reaction and diffusion of the tool and the workpiece material at a processing temperature of more than 800 °C are also one of the reasons for the formation of groove wear. Because during the machining process, the titanium molecules of the workpiece accumulate in the front of the blade and are “welded” to the blade edge under high pressure and high temperature, forming a built-up edge. When the built-up edge peels off the cutting edge, the carbide coating of the insert is taken away.

Due to the heat resistance of titanium, cooling is crucial in the machining process. The purpose of cooling is to keep the cutting edge and tool surface from overheating. Use end coolant for excellent chip evacuation when shoulder milling and face milling of pockets, pockets or full grooves. When cutting titanium metal, the chips are easy to stick to the cutting edge, causing the next round of milling cutter to cut the chips again, often causing the edge line to chip. Each insert cavity has its own coolant hole/injection to address this issue and enhance constant edge performance. Another neat solution is threaded cooling holes. Long edge milling cutters have many inserts. Applying coolant to each hole requires a high pump capacity and pressure. On the other hand, it can block unwanted holes as needed, thereby maximizing flow to the holes that are needed.

Orders from Thailand customers are being prepared

This is our second cooperation with a Thailand customer. The customer expressed that the first cooperation was very satisfied with our product quality and service, and hoped for long-term cooperation in the future!

Orders from Thailand customers are being prepared

这是我们与泰国客户的第二次合作。客户表示第一次合作对我们的产品质量和服务非常满意,希望以后能长期合作!

 

Customers from Indonesia have been successfully delivered

Product name: ASTM B338 Grade 2 seamless titanium tube
Destination: Indonesia
Specifications: 19.05*1.00*6000mm
Quantity: 2 tons

Dear friends, if you have the same needs, please contact us. Email:[email protected] Tel: +86-29-8950 6568

Hastelloy C22 Welded Tube order is ready for shipping

Through 30 days hard work, finally, we successfully delivered 2 pieces ∅239.6x8x4000mm welded Hastelloy C22 Tubes.

Standard: ASTM B626/B619, Grade: UNS N06022/C22.

They will be shipped by sea to our French customer. Hereby I am sharing some photos with you:

Tube Wall Thickness Measurement:

Thickness measuring

Tube OD Measurement:

Tube OD measurement

PMI TEST:

PMI TEST

Tube surface:

Tube surface

If you have RFQs for Incoloy 825, 800H/HT, Monel 400, Inconel 600, Inconel 601, Inconel 625, Inconel 718, Hastelloy C22, B2, X, G30, C276, welcome to contact us for quote!