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Can I have a trial order only for several tons carbon steel pipe?

Yes,We can ship the regular specifications to you with LCL service. Our minimum order quantity is 2-5 Tons. For major engineering projects, we can provide you with free samples, but there will be a shipping cost. The length of the steel pipe sample is within 20 centimeters.    Contact us immediately to request free samples. Steel Tube Samples Type


Anti-rusted oil painting,varnish painting,ral3000 painted,galvanized,3LPE, 3PP


Q195 = S195 / A53 Grade AQ235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2Q345 = S355JR / A500 Grade B Grade CQ235 Al killed = EN39 S235GTL245 = Api 5L / ASTM A106 Grade B

How to Protect Black Pipe ?

Black pipe is plain steel pipe without any protective coatings. Black pipe is used for a variety of applications around the home. It is very common to see black pipe used for your natural gas line and sprinkler system lines. Since black pipe has no protective coating, it may rust easily in wet or humid environments. To stop the pipe from rusting or corroding on the outside, you should provide a layer of protection on the outside of the pipe. The easiest method is painting it.

Yuantai Derun is a gold supplier and do trade assurance or not?

YES. We have strong cooperation with SINOSURE

What does RHS mean ?

RHS stands for Rectangular Hollow Section, that is rectangular steel pipe.We also have square hollow section steel pipe, according to standard: ASTM A500 , EN10219 , JIS G3466 , GB/T6728 cold formed square and rectangular steel pipe.

Which Available steel products from Tianjin YUANTAI DERUN have?

square steel pipe,rectangular steel pipe,ERW steel pipe, ZAM steel pipe,SSAW steel pipe, LSAW steel pipe, galvanized steel pipe, seamless steel pipe,stainless steel pipe, casing and tubing pipe,ZMA steel coil,GI coil,PPGI coil etc.

What is YUANTAI DERUN terms of payment?

TT, L/C(For big order,30-90 days can be acceptable).

Why Does Steel PIPE Rust?

Steel will be oxidized and rusted,so Oiling and wrapping can protect steel pipe from rust

What shipping method YUANTAI DERUN use?

1. OD 219mm and below In hexagonal seaworthy bundles packed by steel strips, With two nylon slings for each bundles2. above OD 219mm in bulk or according to custom opinion3. 25 tons/container and 5 tons/size for a trial order;4. For 20" container the max length is 5.8m;



What is alloy steel?

An iron-based mixture is considered to be an alloy steel when manganese is greater than 1.65%, silicon over 0.5%, copper above 0.6%, or other minimum quantities of alloying elements such as chromium, nickel, molybdenum, or tungsten are present. An enormous variety of distinct properties can be created for the steel by substituting these elements in the recipe.

What is Argon-Oxygen Decarburization?

A process for further refinement of stainless steel through reduction of carbon contentThe amount of carbon in stainless steel must be lower than that in carbon steel or lower alloy steel (i.e., steel with alloying element content below 5%). While electric arc furnaces (EAF) are the conventional means of melting and refining stainless steel, AOD is an economical supplement, as operating time is shorter and temperatures are lower than in EAF steelmaking. In addition, using AOD for refining stainless steel increases the availability of the EAF for melting purposes.Molten, unrefined steel is transferred from the EAF into a separate vessel. A mixture of argon and oxygen is blown from the bottom of the vessel through the melted steel. Cleaning agents are added to the vessel along with these gases to eliminate impurities, while the oxygen combines with carbon in the unrefined steel to reduce the carbon level. The presence of argon enhances the affinity of carbon for oxygen and thus facilitates the removal of carbon.

What is the corrosion of structural steel?

The corrosion of structural steel is an electrochemical process that requires the simultaneous presence of moisture and oxygen. In the absence of either, corrosion does not occur. Essentially, the iron in the steel is oxidised to produce rust, which occupies approximately 6 times the volume of the original material consumed in the process. The general corrosion process is illustrated here.As well as general corrosion, there are various types of localised corrosion that can also occur; bimetallic corrosion, pitting corrosion and crevice corrosion. However, these tend not to be significant for structural steelwork.The rate at which the corrosion process progresses depends on a number of factors relating to the ‘micro-climate’ immediately surrounding the structure, principally the time of wetness and the atmospheric pollution level. Because of variations in atmospheric environments, corrosion rate data cannot be generalised. However, environments can be broadly classified, and corresponding measured steel corrosion rates provide a useful indication of likely corrosion rates. More information can be found in BS EN ISO 12944-2 and BS EN ISO 9223The components of steel structure shall be painted with primer and sealing paint at the production site, and then painted with intermediate paint and fluorocarbon paint (gray) at the construction site, and the color of the paint will become gray. After assembly, apply "top coat" and "top coat" for six times to achieve the best anti-corrosion effect.