TR11 steel is a high-speed tool steel with excellent hardness and strength. It can be quenched to achieve even higher hardness levels. It also possesses high toughness, allowing it to withstand significant impact during operation and reduce the risk of tool breakage.

TR11 high-speed steel utilizes a special formulation and heat treatment process to achieve exceptional corrosion resistance. It can withstand harsh environments such as moisture, acidity, and alkalinity, and is resistant to rust and corrosion. This characteristic makes TR11 widely used in the manufacture of metal machinery parts and cutting tools.

In corrosive media such as acid mist and acidic solutions, a dense oxide film forms on the surface of TR11, effectively isolating the metal from the corrosive medium and providing corrosion protection. TR11's compact crystal structure offers high corrosion resistance, making it less susceptible to erosion by external factors.

TR11 steel's corrosion resistance has made it an indispensable material in the manufacturing industry. Its corrosion resistance reduces wear and tear on machinery parts and extends their service life. The surface flatness of TR11 material is high, and it is not easy to crack and corrode, which ensures the stability of product quality. TR11 material has high hardness and wear resistance, and is suitable for manufacturing high-speed cutting tools, which improves processing efficiency.

Characteristics of Zinc Plating
Zinc is stable in dry environments and rarely tarnishes. However, once exposed to water or humid atmospheres, zinc reacts with oxygen or carbon dioxide to form an oxide or alkaline zinc carbonate film. This film provides protection, preventing further oxidation. Zinc is highly susceptible to corrosion in environments containing acids, alkalis, and sulfides. To enhance its corrosion resistance, zinc coatings are typically passivated, such as in chromic acid or chromate solutions. The resulting passivation film effectively prevents zinc from reacting with moisture. Dehydrogenation treatment is required for spring parts, thin-walled parts, and steel parts requiring high mechanical strength, while this step is generally not required for copper and copper alloy parts.

Characteristics of Cadmium Plating
Cadmium plating performs well in marine atmospheres or in hot water above 70°C, offering strong corrosion resistance and lubricity. It dissolves slowly in dilute hydrochloric acid but is highly soluble in nitric acid and insoluble in alkalis. Cadmium coatings are softer than zinc coatings, less susceptible to hydrogen embrittlement, and offer stronger adhesion. Under certain electrolytic conditions, they can even be more aesthetically pleasing. However, please note that the gases and soluble cadmium salts produced by cadmium during melting are toxic.
Under normal conditions, cadmium acts as a cathodic coating on steel, but it becomes anodic in marine and high-temperature atmospheres. Therefore, cadmium coatings are often used to protect parts from corrosion in seawater or similar salt solutions, as well as in atmospheres saturated with seawater vapor. Cadmium plating is used on many parts in the aviation, marine, and electronics industries. It can also be used for polishing, phosphating, and as a paint primer, but is not suitable for food containers.


Characteristics of Chromium Plating
Chromium is very stable in humid atmospheres, alkalis, nitric acid, sulfides, carbonate solutions, and organic acids, but is soluble in hydrochloric acid and hot concentrated sulfuric acid. Under direct current, if a chromium coating acts as an anode, it may dissolve in caustic soda solutions. Advantages of chromium coatings include strong adhesion, high hardness, good wear resistance, and high light reflectivity. It also has high heat resistance, retaining its original color below 480°C, but oxidizing above 500°C and significantly decreasing its hardness at 700°C. However, the chromium layer is hard but brittle and easily flakes off, especially when subjected to alternating shock loads. Chromium is also porous. Metallic chromium readily forms a passive film in air, changing its potential, making it a cathodic coating on iron.


Characteristics of Nickel Plating
Nickel exhibits excellent chemical stability at room temperature and resists discoloration. It only oxidizes at temperatures above 600°C. It dissolves slowly in sulfuric and hydrochloric acids but is soluble in dilute nitric acid. Furthermore, nickel readily forms a passive film in concentrated nitric acid, providing excellent corrosion resistance.
Characteristics of nickel plating include high hardness, easy polishing, high light reflectivity, and aesthetic appeal. However, it also suffers from the disadvantage of porosity. To overcome this drawback, multilayer metal plating is used, often with nickel as the intermediate layer. Nickel is a cathodic coating on iron and an anodic coating on copper.

Before purchasing large-diameter spiral steel pipe, purchase according to pre-designed specifications, length, material, wall thickness, welding standards, and weld requirements, ensuring thorough pre-purchase communication.

First, consider the standard. For example, 800mm is also known as DN800, and also includes 820mm and 813mm in the A and B series. Alternatively, the outer diameter of 800mm should be clearly indicated to avoid unnecessary losses.

The wall thickness requirement for large-diameter straight seam steel pipe is 16mm. The actual thickness of the raw material may vary between 15.75mm and 16.2mm, with some fluctuation. These fluctuations are normal. Since straight seam steel pipe is priced by tonnage, prior communication is necessary to avoid weight discrepancies.

The standard length of large-diameter straight seam steel pipe is 12 meters. If a custom length is required, it is recommended to communicate in advance, as the price of custom lengths will be relatively higher. If no prior communication is made, the typical length is 9.87 meters, and the manufacturer will generally provide 9.9 meters directly. 

 When purchasing large-diameter straight seam steel pipe, ensure thorough communication with the supplier to ensure that the materials used are not OEM products. A raw material list from the steel mill must be provided to verify the authenticity of the materials. Any material issues will result in a return and compensation.

Welding standards during production and processing must comply with the requirements of Automatic Submerged Arc Welding (LSAW) GB/T3091-2015, and a product quality certificate must be provided. If these standards are not met, the product will be deemed unqualified.

When purchasing large-diameter straight seam steel pipe, be sure to confirm weld inspection requirements in advance, as this testing incurs additional costs.

In addition, large-diameter straight seam steel pipe over 1020 mm may have two welds. Many projects do not allow the use of two welds without prior consultation, and this will be considered a defective pipe.

Thus, prior consultation is crucial before purchasing any steel pipe to avoid unnecessary disputes and financial losses.