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Sunny Steel Enterprise Ltd.

Sunny Steel Enterprise Ltd.

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Sunny Steel Enterprise Ltd. is a professional steel exporter in China. We specialize in the production of steel product, including stainless steel, galvanized steel, pre-painted steel and carbon steel pipes, ceramic lined composite steel pipe and fittings,elbow, bending and the related products, covering pipe & tube , fitting, bar etc. Based on the standing better and faster service,we have been the best partner both of the steel factories and suppliers.
We offer perfect service to the mills and bring in the highest quality levels at the most competitive price for our customers. Our entire operations are focused on the precise demands of our customers needs.
Our production bases cover most of China, with a production capacity of 300,000 MT annually, Size range from O.D: 8--141mm, W.T.0.8--12mm. (cold drawn tube). O.D 141mm--610mm, W.T :5--25mm(hot rolled pipe). With a strict quality assurance system to the manufacturing process, including steel making and finished products inspection.
Factory and industrial products
In addition to our steel products for construction, we also offer a variety of steel fabrication products for use in industry. We provide local factories with steel cutting, fabricating, and distributing pipe fittings anc composite pipes.
Our versatility ensures we will be able to provide you with the steel products you require to to complete a project, from start to finish.
Our team
Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you´ve got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Main Materials >>:
Our highly-skilled manpower is dedicated to producing the finest quality steel pipe, pipe fittings, meeting a wide variety of material specifications. Their knowledge and experience of metal properties, welding procedures and quality control have set the pace and standard expected by our customers world-wide.


Today, most industrial plants especially in the oil and gas, offshore, sea water desalination, power generation industries work in very critical operating conditions and require more and more the use of special alloys resistant to corrosion and high temperatures.

How to distinguish pipe material

Steel is steel carbon content between 0.04% -2.3% of the iron-carbon alloys. In order to ensure its toughness and ductility, the carbon content of not more than 1.7%. The main elements of the steel in addition to iron, carbon, there are silicon, manganese, sulfur, and phosphorus.

Our highly-skilled manpower is dedicated to producing the finest quality steel pipe, pipe fittings, meeting a wide variety of material specifications. Their knowledge and experience of metal properties, welding procedures and quality control have set the pace and standard expected by our customers world-wide.

The primary raw material in pipe production is steel. Steel is made up of primarily iron. Other metals that may be present in the alloy include aluminum, manganese, titanium, tungsten, vanadium, and zirconium. Some finishing materials are sometimes used during production. For example, paint may be used if the pipe is coated. Typically, a light amount of oil is applied to steel pipes at the end of the production line. This helps protect the pipe. While it is not actually a part of the finished product, sulfuric acid is used in one manufacturing step to clean the pipe.

Chemical Composition of Steel

Steel is an alloy of iron and other elements. Some elements are intentionally added to iron for the purpose of attaining certain specific properties and characteristics. Other elements are present incidentally and cannot be easily removed. Such elements are referred to as “trace” or “residual” elements.

PMI test

PMI (Positive Material Identification) testing is the analysis of materials to determine the chemical composition of a metal or alloy at particular (usually multiple) steps of alloy manufacturing or in-process alloy installation.

Many product specifications have mandatory requirements for reporting certain elements and these vary. Most mills routinely provide heat analysis which includes the elements below. Although it is possible to analyze for other elements this is most often not practical or necessary unless they are additions (e.g. Pb – Lead, Sb – Antimony, or Co - Cobalt).

Carbon is the principal hardening element in steel. Hardness and strength increase proportionally as the Carbon content increases up to about 0.85%. Carbon has a negative effect on ductility, weldability, and toughness. The carbon range in ULC Steel is usually 0.002 – 0.007%. The minimum level of Carbon in Plain Carbon Steel and HSLA is 0.02%. Plain Carbon Steel grades go up to 0.95%, HSLA Steels to 0.13%.

Manganese is present in all commercial steel as an addition and contributes significantly to steel’s strength and hardness in many the same manner but to a lesser degree than carbon. Manganese improves cold temperature impact toughness. Increasing the Manganese content decreases ductility and weldability. The typical Manganese content is 0.20 – 2.00%.

Phosphorus is most often a residual but it can be an addition. As an addition, it increases hardness and tensile strength. It is detrimental to ductility, weldability, and toughness. Phosphorus is also used in re-phosphorized high-strength steel for automotive body panels. Typical amounts as a residual are less than 0.020%.

Sulphur is present in raw materials used in iron making. The steelmaking process is designed to remove it as it is almost always a detrimental impurity. A typical amount in commercial steel is 0.012%, and 0.005% in formable HSLA.

Silicon can be an addition or a residual. In addition, it has the effect of increasing strength but to a lesser extent than Manganese. A typical minimum addition is 0.10%. For post galvanizing applications the desired residual maximum is 0.04%.

Copper, Nickel, Chromium (Chrome), Molybdenum (Moly), and Tin are the most commonly found residuals in steel. The amount in which they are present is controlled by scrap management in the steelmaking process. Typically the specified maximum residual quantities are 0.20%, 0.20%, 0.15%, and 0.06% respectively for Copper Nickel, Chromium, and Molybdenum but the acceptable limits depend mainly on product requirements. Copper, Nickel, Chromium, and Molybdenum, when they are additions, have very specific enhancing effects on steel. A Tin residual maximum is not usually specified but its content in steel is normally kept to 0.03% or less due to its detrimental characteristics.

Vanadium, Columbium, and Titanium are strengthening elements that are added to steel singly or in combination. In very small quantities they can have a very significant effect hence they are termed micro-alloys. Typical amounts are 0.01 to 0.10%. In Ultra-Low Carbon Steel Titanium and Columbium are added as “stabilizing” agents (meaning that they combine with the Carbon and Nitrogen remaining in the liquid steel after vacuum degassing). The end result is superior formability and surface quality.

Aluminum is used primarily as a deoxidizing agent in steelmaking, combining with oxygen in the steel to form aluminum oxides which can float out in the slag. Typically 0.01% is considered the minimum required for “Aluminum killed steel”. Aluminum acts as a grain refiner during hot rolling by combining with Nitrogen to produce aluminum-nitride precipitates. In downstream processing aluminum-nitride, precipitates can be controlled to affect coil properties.

Nitrogen can enter steel as an impurity or as an intentional addition. Typically the residual levels are below 0.0100 (100 ppm).

Boron is most commonly added to steel to increase its hardenability but in low carbon steels, it can be added to tie up Nitrogen and help reduce the Yield Point Elongation thus minimizing coil breaks. At the same time, when processed appropriately, the product will have excellent formability. For this purpose, it is added in amounts up to approximately 0.009%. As a residual in steel, it is usually less than 0.0005%.

Calcium is added to steel for sulfide shape control in order to enhance formability (it combines with Sulphur to form round inclusions). It is commonly used in HSLA steels especially at higher strength levels. A typical addition is 0.003%.


In the purchase of steel products, there are often questions of detail. Every company has their own demands.

Whether you are inquiring about one of our steel products or you are interested in having our engineering team create something specific for your facility, Sunny Steel can have a part in your hands in no time.

Please check the help section first to see if your question may be answered there.
You can get in touch by telephone, post, online or E-mail.


Tel.: +8621 3378 0199

Sunny Steel looks forward to hearing from you.

We could talk about your situation in a telephone call. Also, if you have questions apart from a specific order, you can contact us at any time.

We pride ourselves on being leaders in the industry for 15 years and counting.

China locations

Shanghai is the largest city by population in the People's Republic of China (PRC)and the largest city proper by population in the world.

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Sunny Steel Enterprise Ltd.

No. of Employees: 50
Annual Sales Volume: 10000000000
Year Established: 2000
Address: No. 273, Siping Road, Shanghai
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