Hot dip galvanized pipe are produced by reacting molten metal with the iron substrate to form an alloy layer, thereby bonding the substrate and the coating together. Hot-dip galvanizing involves first acid-washing the steel pipe to remove surface rust. After acid washing, the pipe is cleaned in a solution of ammonium chloride or zinc chloride, or a mixture of both, before being immersed in the hot-dip galvanizing tank.
Hot-dip galvanizing offers advantages such as uniform coating, strong adhesion, and a long service life. The steel pipe substrate undergoes complex physical and chemical reactions with the molten galvanizing solution, forming a corrosion-resistant, structurally dense zinc-iron alloy layer. This alloy layer integrates with the pure zinc layer and the steel pipe substrate, resulting in strong corrosion resistance.
1. Uniformity of the zinc coating: Steel pipe samples must not turn red (copper-colored) after being continuously immersed in a copper sulfate solution five times.
2. Surface quality: The surface of galvanized steel pipes should have a complete zinc coating, with no uncoated black spots or bubbles. Minor roughness and localized zinc nodules are permitted.
3. Galvanized layer weight: According to the buyer's requirements, the galvanized steel pipe can undergo zinc layer weight testing, with an average value of no less than 500 g/m², and no sample should be less than 480 g/m².
Hot dipped galvanized pipe made by black pipes dipped into zinc pool for galvanized.
zinc coating :200-600g /m2
Steel Grade: Q195-Q345, S235JR, S275JR, S355JR, S355J2H, STK400/500.
Standard: BS1387-1985, DIN EN10025 ,EN10219, JIS G3444:2004, GB/T3091-2001.
ASTM A53: GR. A , GR. B, GR. C, GR. D, SCH40/80/STD
End treatment : threaded , screwed/ socket
Packing: Two tags on each bundle, Wrapped in waterproof paper
Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties
How do I order our products?
Ordering our steel products is very simple. You just need to follow the steps below:
1. Browse our website to find the right product for your needs. You can also contact us through website message, email, WhatsApp, etc. to tell us your requirements.
2. When we receive your quote request, we will reply you within 12 hours (if it is a weekend, we will reply you as soon as possible on Monday). If you are in a hurry to get a quote, you can call us or chat with us online and we will answer your questions and provide you with more information.
3.Confirm the details of the order, such as product model, quantity (usually starting from one container, about 28tons), price, delivery time, payment terms, etc. We will send you a proforma invoice for your confirmation.
4.Make the payment, we will start the production as soon as possible, we accept all kinds of payment methods, such as: telegraphic transfer, letter of credit, etc.
5.Receive the goods and check the quality and quantity. Packing and shipping to you according to your requirement. We will also provide after-sale service for you.
Post time: May-29-2025
