Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!

Although stainless steel is much more resistant to corrosion than ordinary carbon or alloy steels, sometime we see rust on Stainless steel. It is ‘stain-less’ not ‘stain impossible’. Sometime we see rust on Stainless steel.  It means it can corrode. Why??? It has some common forms of corrosion in Stainless steel: Pitting corrosion: (pitting corrosion of stainless steel in a chloride-containing environment) Pitting corrosion is an electrochemical oxidation-reduction (redox) process, which occurs within localized holes (cells) on the surface of metals coated with a passive film. The passive layer on stainless steel can be attacked by certain chemical species. The chloride ion Cl- is the most … Continue reading Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!

Stainless steel material: what difference between stainless steel and carbon steel?

Selecting an appropriate type of steel for a project is one of the most important decisions to make. However, before deciding between individual grades, you first have to decide what type of steel to use, such as carbon steel or stainless steel. In general, steel is an alloy with Iron being the main element. An alloy is a material made of a mixture of metals or a metal with other elements. These types of alloys are often cheaper and have improved properties. In the case of steel, iron is primarily mixed with carbon and few other elements. Mixing with carbon makes steel stronger, … Continue reading Stainless steel material: what difference between stainless steel and carbon steel?

Stainless Steel Material: How is stainless steel made?

Stainless steel is known for excellent corrosion resistance. It is an integral part of modern life and is used in a range of applications, including heavy industry, architecture, automotive manufacture, surgery and dentistry. Stainless steel is an iron alloy with added elements such as chromium, nickel, silicon, manganese, nitrogen and carbon. The properties of the final alloy can be fine-tuned by altering the amounts of the various elements. Now we will know How Stainless steel is made? Raw materials:  Stainless steel is the most recycled material in the world and it is estimated that 82% of the stainless steel in use today will be recycled … Continue reading Stainless Steel Material: How is stainless steel made?

Stainless Steel Material: what is stainless steel?

For this topic, we will have a seri about this material type: Stainless steel material. 1.  What is Stainless Steel? 2.  Corrosion Mechanisms 3.  Environmental Factors That Influence Corrosion in Water 4.  Construction and Fabrication Influences on Stainless Steel Corrosion 5.  Material Handling After Fabrication and During Installation /  Stock Materials and Fabrication of Stainless Steel Parts 6. CORROSION RESISTANCE TESTING METHODS 7.  UTILITY AND FABRICATOR EXPERIENCES WITH STAINLESS STEEL CORROSION 8.  GUIDELINES FOR STAINLESS STEEL USE 9. Other… Okay! Now we start. Are you ready? I. What is Stainless Steel? A metallic alloy (i.e., metal made of multiple elements such as chromium, … Continue reading Stainless Steel Material: what is stainless steel?

TACK WELDER

Tack welding is a major part of welding which are used as a temporary means to hold the components in the proper location, alignment, and distance apart, while welding. The engineers use high heat input process for the welding and the tack is applied by the shielded metal arc welding process. The tack is a very rapid quench application and a brittle, crack sensitive micro structure results usually at the root of the weld. There’re two type of tack-welds as defined in below attached file ( Temporary & Incorporated ) TACK WELDS For saving the qualification cost, some yard make … Continue reading TACK WELDER

WELDING INTERRUPTION

Definition – Interruption of welding means dropping from preheat temperature to ambient temperature prior to completion of welding or performing PWHT. This aspects most applied on high heat-sensitive material like (P3, P4, P5A, P5C, 10H High alloy materials) with regarding to Cold cracking or HIC. The weld can be interrupted and the weld may be allowed to cool prior to post weld heat treatment, provided the following conditions are satisfied: 1. A minimum of 3/8 in. thickness of weld is deposited or 25% of the welding groove is filled, whichever is greater 2. The weld is allowed to cool slowly … Continue reading WELDING INTERRUPTION