Galvanized Steel Sheet-----Pre-painted Galvanized Steel Sheet

Galvanized Steel Sheet-----Pre-painted Galvanized Steel Sheet

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Pre-painted Galvanized plate refers that when the surface pretreatment of base plate, covering one layer or 2 layers (more than 2 layers once necessary) organic coating on the surface with the tactic of continuous roller coating; so conduct drying and activity.

Compared with single half spraying or brushing on the surface of forming metal, the coating quality of color-coated plate is additional uniform, stable and ideal. Pre-painted plate is characterised of wonderful decoration, mould ability, corrosion resistance, robust coating adhesive force and may keep the novel luster for a protracted time. Since color-coated plate has not solely mechanical strength and shaping performances of plate, however additionally favorable decoration and corrosion resistance of organic material. It will understand extremely effective construction and husband the energy; stop the pollution caused by second method and alternative favorable economic edges. Currently, it\'s become the best stuff in construction, appliance, lightweight trade, machinery and physical science and alternative industries.

Main application

• Doors : Security door,garage door,in-house door,Shutter door .
• Furniture :Steel and picket furnishings,wardrobe,table,chair,tea table,change cupboard,archive cupboard,bookshelf,office cupboard,etc.
• Offices :Copier cupboard,vendor,computer case,switch board,instrument cupboard,tool box,inner decoration for raise,etc.
• Decorations : laptop ronnm,telephone closet,parking heap,waiting booth,wall,column,surface end of wall,Persian blinds with picket grains,and rooms in traveler liner,entertainment partitions and clean panels for pharmaceutical manufacturing plant and foodstuff manufacturing plant.
• Household appliances : white goods,ice cuber,washing machine,air conditioner,electric fan,lamps,solar-energy hot-water heater,electric hot-water heater,etc.
• Transport : Inner decoration panel of auto,train’s partition and internal decoration panel,ship’sparting panel and internal decoration panels,etc.
• Building :Internal and external walls,steel and plastic panel,aluminum and plastic panel,roof,partition,suspended ceiling,ceiling,door head,plant’swall panel,movable house,urban utility fence,booth,garage,ventilation duct,etc.

Finned Tube----Hair Pin Type Heat Exchanger

Finned Tube----Hair Pin Type Heat Exchanger

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The Hair pin Type Heat Exchanger is a true counter-current flow and are especially suitable for extreme temperature crossing, high pressure, high temperature, and low to moderate surface area requirements. Hairpin heat exchanger designs can increase heat transfer coefficients in single-pass process streams with high temperature differentials.Heat exchanger consists of a pair of concentric tubes. One of the fluids used for heat exchange flows in the inner tube, and the other in the annular space between the two tubes.Our Hairpin Exchangers are available in single tube (Double Pipe) or multiple tubes within a hairpin shell , bare tubes, finned tubes, U-tubes, straight tubes, fixed tube sheets and removable bundle. Hairpin heat exchangers utilize true counter-current flow. When a process calls for a temperature cross, a hairpin heat exchanger is the most efficient design, with fewer sections and less surface area. Hairpin heat exchangers offer the mechanical and maintenance engineer advantages inherent with their design.

Hair Pin Type Heat Exchanger Advantages

• Lower cost
• Mobile exchanger
• Small size and good position in the vat
• Good heat exchange coefficient
• Little fur deposit thanks to the polished finish
• Good fluid circulation in the tube
• Vinification of reds or whites
• Independent tubesheets for high terminal temperature differences.
• Thermal shock.
• Cycling.
• Long radius U-bends for effective thermal expansion.
• High temperature differences.
• Ease of cleaning.
• All-welded baffle cages for durability.
• High pressure closures for pressures
• No internal bolting.

Hair Pin Type Heat Exchanger Applications

• Temperature Cross
• High Tubeside Pressure
• Low Flowrates
• Cyclic Service
• Dirty Service
• Heating or Cooling Vapors
• Slurry applications with minimum velocity requirements and no "dead space" velocity reductions.
• Complete Vaporization Requirements
• Exchangers subject to Thermal Shock
• High Terminal Temperature Differences
• System requiring a moderate quantity of heat exchange with low flow rates
• System with temperature ranges requiring a perfect countercurrent flow.
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Stainless steel----highly alloyed austenitic stainless steel 310S (S31008)/ EN 1.4845

Stainless steel----highly alloyed austenitic stainless steel 310S (S31008)/ EN 1.4845 

Introduction: SS310 is a highly alloyed austenitic stainless steel designed for elevated-temperature service. The high Cr and Ni contents enable this alloy to resist oxidation in continuous service at temperatures up to 1200°C provided reducing sulfur gases are not present. In intermittent service it can be used at temperatures up to 1030°C as it resists scaling and has a relatively low coefficient of expansion. This alloy has superior resistance to both SS304 and SS309 in carburizing and reducing environments. 

SS310 types are used for their high-temperature oxidation resistance for applications such as furnace parts, mufflers, radiant tubes, ammonia converters, etc.

Product Range: 

Product is available in Cold Rolled, Continuous Mill Plate and Plate Mill Plate form up to 60" wide in various thicknesses. 

For inquiry about minimum quantity, specific thickness and tolerances.  

Certification: ASTM A240, A480, A666, ASME SA240, SA480, SA666, ASTM A262, EN 10088-2, EN 10028-7.

Thermal Processing & Fabrication Annealing

Annealing is achieved by heating to between 1030°C and 1150°C for 90 minutes per 25mm thickness followed by water quenching. Annealing will ensure that any carbide precipitates are taken back into solution. 

Cold Working

SS310 can be deep drawn, stamped, headed and upset without difficulty. Since SS310 work hardens, severe forming operations should be followed by annealing.  

Hot Working

SS310 can be forged, hot headed and upset satisfactorily. Uniform heating of the steel in the range of 1150°C and 1250°C is required. The finishing temperatures should not be below 950°C. Forgings should be cooled rapidly in air or water. As precipitation of carbides can be harmful in corrosive environments, SS310S is recommended. 

Welding

SS310 can be satisfactorily welded and brazed by all methods, giving a tough weld. SS310S should be specified if carbide precipitation can have a detrimental effect on the performance of the steel under operating conditions. 

Welding procedures for SS310 will have to be selected with care in order to avoid hot cracking due to the fully austenitic weld microstructure obtained from using matching filler metals.  

Oxidation 

In many processes, isothermal (constant temperature) conditions are not maintained and process temperatures vary. Expansion differences between the base metal and the scale during heating and cooling can cause cracking and spalling of the protective scale. 

This allows the oxidizing media to attack the exposed metal surface. The spalling resistance is greatly improved with the higher nickel content of SS310 because nickel reduces the expansion differential between the scale and the base metal. 

Corrosion Resistance

Because of the many possible variations involved—temperature, corrosive environment, alloy composition, time, operating practice, etc.—it is difficult to discuss every combination in detail. Thus, the following data should be used as a guideline. 

Effect of atmosphere

An increase in corrosion rate can be expected in the presence of water vapor for the traditional 18/8 type stainless steels. The increased nickel and chromium contents of SS310 provide good resistance to moist air at temperatures in excess of 980°C. 

Flug Gases 

It is extremely difficult to generalize corrosion rates in flue and process gases since gas composition and temperature may vary considerably within the same process unit.  

Combustion gases normally contain sulfur compounds, as sulfur dioxide is present as an oxidizing gas, along with carbon dioxide, nitrogen, carbon monoxide and excess oxygen. Protective oxides are generally formed and, depending on exact conditions, the corrosion rate may be similar or slightly greater than for service in air.

Reducing flue gases contain varying amounts of hydrogen sulfide, hydrogen, carbon monoxide, carbon dioxide and nitrogen. The corrosion rates encountered in these environments are sensitive to hydrogen sulfide content and temperature, and satisfactory material selection often necessitates service testing. The high nickel content of SS310 may be deleterious in some instances due to sulfidation, in which case SS309 may be the preferred material. 

Carburisation 

High chromium and nickel contents result in a slower diffusion rate of carbon into the steel. SS310 therefore has good resistance to carburizing atmospheres. 

Ammonia and Nitrogen 

The high nickel content of CS310 ensures a good resistance to ammonia atmospheres at high temperatures. Typical corrosion rates for SS310 in an ammonia converter containing 5-6% NH3 after 30,000 hours at 500°C, are in the region of 0.003mm/yr. 

Stainless steel----12Cr13 stainless steel band introduced

Stainless steel----2Cr13 stainless steel band introduced

2Cr13 Definitions

2Cr13 stainless steel cold-rolled steel made ​​by the ordinary , including ordinary carbon steel , low alloy steel strip , bright ordinary carbon steel , plain carbon steel slitting , slitting low-alloy steel, steel trolleys , playing steel tape, flashlights steel, steel tube , steel cables . Mainly used for a variety of structural parts and special products .

2Cr13 Type

Hot-rolled steel 2Cr13 : from a variety of high quality hot rolled steel strip made ​​. Which are commonly used spring steel watches , watches shell steel, chrome steel , such as aluminum .

Cold-rolled steel 2Cr13 : made ​​from a variety of high-quality cold-rolled steel with carbon structural steel, steel tape measure , mechanical chain steel, carbon tool steel, alloy structural steel , spring steel , alloy tool steel belt, ball bearing steel, stainless steel, high-speed tool steel , iron steel, silicon steel, nickel-chromium steel , precision alloy steel belt. Use high-quality sheet steel and similar purposes .

2Cr13  Use

2Cr13 stainless steel because of its unique hardness it is widely used in the development of mold , tool material, conventional gaskets, packing Crust and other metal stamping industries.2Cr13 stainless steel vacuum equipment suitable furnace, oil quench hardening, annealing , normalizing heat treatment process .Hardness can reach HRC52-65 degrees. Metal stamping industry to meet our needs .

2Cr13 stainless steel with chemical elements

Carbon C          0.36 ~ 0.45

Si Si                  ≤ 0.60

Manganese Mn ≤ 0.80

Sulfur S             ≤ 0.030

Phosphorus P     ≤ 0.035

Chromium Cr    12.0 ~ 14.00

Ni Ni                ≤ 0.60

2Cr13 stainless steel heat treatment process

Workpiece quenching processGeneral workpiece : quenching and tempering → ​​→ → washing sand ( or shot , etc. ) surface cleaning → ​​test . Shaft parts and deformation of the workpiece : quenching and tempering washing → → → → straightening → ​​blast → to deal with stress test

2Cr13  Mechanical Properties

Tensile strength σb (MPa): quenching and tempering , ≥ 635Conditions yield strength σ0.2 (MPa): quenching and tempering , ≥ 440Elongation δ5 (%): quenching and tempering , ≥ 20Reduction of area ψ (%): quenching and tempering , ≥ 50Impact energy Akv (J): quenching and tempering , ≥ 63Hardness: annealing , ≤ 223HB; quenching and tempering , ≥ 192HBHeat treatment and microstructure specifications
Heat treatment specifications:1 ) annealing , 800 ~ 900 ℃ slow cooling or rapid cooling to about 750 ℃ ​​;2 ) quenching , 920 ~ 980 ℃ oil cooling ;3 ) Tempering , 600 ~ 750 ℃ ​​rapid cooling .Microstructure: Organizing for the martensitic .

2Cr13  Delivery status

Generally to heat treatment delivery , treatment types specified in the contract ; not indicated, by not heat treatment delivery. 

Finned Tube----Screw thread tube heat exchanger

Finned Tube----Screw thread tube heat exchanger

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Screw thread tube heat exchanger is a new energy-efficient heat transfer equipment  introduced  in recent years, which is designed to completely break through the traditional shell and tube heat exchanger design ideas, choose from materials to structure, shape size, etc. with the traditional shell and tube heat exchanger has a substantial change compared to a number of technical innovations so that heat from the exterior to the various aspects of performance significantly beyond the traditional shell and tube heat exchangers , heat exchanger has changed the traditional simple structure , bulky , rough shape , inefficiency features, is the traditional heat exchanger replacement products.

1. Screw thread tube heat exchanger technology advantages

At present, heat transfer equipment industry technology updates slower, longer product replacement cycle , the manufacturers have generally invested in R & D is low , the manufacturers of the product are mostly imitate each other , resulting in product homogeneity is more prominent.

Screw thread tube heat exchanger heat transfer coefficient from the most important feature of its ultra-high, generally 2-3 times that of conventional shell and tube heat exchanger , along with better energy efficiency , with the traditional shell and tube heat exchangers is compared to more than 10% energy saving .

Outside screw thread tube heat exchanger also changed the image of the traditional extensive heat exchanger shell from the cylinder to the flange , all made ​​of stainless steel material , the outer surface of the heat exchanger to make mirror polished , beautiful and greatly improved .

Screw thread tube heat exchanger advantage also comes from its size and weighs only a fraction of the traditional shell and tube heat exchanger , the installation process is no longer the need for complex tools and lifting equipment, labor to complete.

The heat resistance due to the larger tube is not suitable for low pressure steam source and water / water heat exchanger conditions.

2. Screw thread tube heat exchanger structure

Screw thread tube heat exchanger consists of two parts consisting of a core and a shell , the core is mainly composed of tubes , shell composed by the barrel and closed top , head down , each with two openings , with the head of an center opening angle of 90 ° , so that all involved in heat exchanger , no dead zone .

3. Screw thread tube heat exchanger applications

Screw thread tube heat exchanger with high efficiency heat transfer performance, steam - water heat exchanger excellent field performance , widely used in HVAC and domestic hot water side, while on the cryogenic unit also has outstanding performance in the chemical and pharmaceutical and achieved a wide range of applications .

4. Advantages of screw thread tube heat exchanger

( A ) high- thread spiral tube heat exchanger thermal efficiency , more energy ( steam ) savings :

Internal unique reverse winding, spiral coil structure to countercurrent heat exchanger , the steam is condensed in the tubes can be fully beam , without going through a secondary heat exchanger , it can save a lot of steam ;

(B ) screw thread tube heat exchanger is stainless steel welding , high temperature high pressure :

As the screw thread tube bundle heat exchanger tubes and all stainless steel casing , with a uniform coefficient of expansion , its highest pressure 1.6MPa, the maximum temperature of 400 ℃, not due to pressure and temperature instability caused by heat 's deformation ; without pressure reducer .

The general volume of heat exchanger is generally made ​​of carbon steel shell , copper tube . Because the material is not the same so different coefficients of expansion , with the expansion and contraction easily crack in the weld of the tube . Coupled with mostly floating coil type , coil constant vibration , more broken pipe . Cause great trouble for the post- overhaul. Another low volume heat exchanger pressure , high temperature and pressure reduction pressures need to install the device , not only the initial investment cost increases , while the steam temperature and pressure reduction device will heat wastage.

(C ) screw thread tube heat exchanger compact, easy to install , small footprint

Screw thread tube heat exchanger small, save infrastructure investment ; light weight, ease of installation , the device can be directly connected to the pipeline , reducing installation costs.

Common bulky volume heat exchanger , typically 10 times the spiral tube heat exchanger thread , a larger area ; install complex and require prefabricated foundation, higher installation costs.

(D ) screw thread tube heat exchanger long life :

The use of screw thread tube heat exchanger Owen (OWEN) turbulence buffeting frequency standards principles, using the smallest gap beam tubes designed to effectively eliminate the turbulence buffeting phenomenon , extending the service life of the heat exchanger , spiral ribbed tube heat exchanger design life of up to 40 years under normal conditions of use , quality problems exchanger 8 year free repair or replacement.

While The general volume of the heat exchanger can only use about five years.

(E ) screw thread tube heat exchanger fouling tendencies low , low maintenance costs

Screw thread tube heat exchanger unique internal structure , unique countercurrent heat exchange surface treatment technology and media on both sides , at the same time improving the overall heat transfer coefficient to ensure that the heat exchanger has a self-cleaning function , low fouling tendency . Also, to ensure the stability of the system , our company with a stainless steel heat balancer , can ensure that the temperature is stable. Even after long-term use of fouling phenomenon , we only use chemical cleaning methods to clean the heat exchanger , time-saving , labor-saving , low cost , good effect .

In contrast, volume heat exchanger requires periodic inspection , conduct a visual inspection at least annually , at least once every three years, internal and external inspection, maintenance workload, high maintenance costs. Especially when the tubes appear broken crack pipes and tubes , the tubes need to be drawn overhaul , which must provide space for a large overhaul tube out . Causing great inconvenience for the overhaul .

( Six ) screw thread tube heat exchanger can be adjusted according to actual usage temperature, and volumetric heat exchanger temperature not higher than the limit value terminal , otherwise it will accelerate the scaling, increase the maintenance workload.

( Seven ) screw thread tube heat exchanger energy saving and environmental protection:

Screw thread tube heat exchanger tube heat medium walk , walk refrigerant shell , cold pack to maintain the flow of heat exchanger itself is dry, does not affect the ambient air . Coupled with heat exchangers and heat balancers are made ​​of stainless steel sanitary grade high temperature sterilization regularly .

Volumetric heat exchanger is because both the water storage tank , and its warm, moist environment to create the conditions for microbial growth , easy to produce a large number of bacteria that can cause infection and inflammation , causing indoor secondary pollution, the threat of human health.