Ss 304 Round Pipes
Ss 304 Round Pipes
Ss 304 Round Pipes
Ss 304 Round Pipes

Ss 304 Round Pipes

There are many kinds of stainless steel pipes, but the main ones have the following uses:
First, the classification of stainless steel pipes
1. Classified by production method:
(1) Seamless pipe - cold drawn pipe, extruded pipe, cold rolled pipe.
(2) Welded pipe:

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Product Introduction

Ss 304 Round Pipes

Classification of stainless steel pipes

Seamless pipe
Welded pipe

一, seamless steel pipe
Stainless steel seamless pipe is a kind of long steel with a hollow section and no joints around it.
1. Seamless steel pipe manufacturing process and flow:
Smelting > Ingot > Rolling > Sawing > Peeling > Piercing > Annealing > Pickling > Ash > Cold drawing > Cutting head > Pickling > Storage
2. The characteristics of seamless steel pipe:
From the above process, it is not difficult to see: first, the thicker the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, its processing costs will rise significantly; Secondly, the process of the product determines its limitations, the general precision of seamless steel pipe is low: uneven wall thickness, low external brightness in the tube, high measurement cost, and the internal appearance of pockmarks, black spots are not easy to remove; Third, its detection and shaping must be processed offline. Therefore, it embodies its superiority in high pressure, high strength and mechanical structure materials.
二, welded steel pipe
Welded steel pipe, referred to as welded pipe, is a stainless steel pipe made of steel plate or steel strip after crimping the unit and the mold.
1. Steel plate > Slitting > Forming > Melting > Induction bright heat treatment > Internal and external bead treatment > Shaping > Sizing > Eddy current testing > Laser sizing > Pickling > Storage
2. Characteristics of welded steel pipe:
It is not difficult to see from the above process flow: First, the product is continuous online production, the thicker the wall thickness, the greater the investment in the unit and the melting equipment, the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio; Secondly, the process of the product determines its advantages and disadvantages. Generally, the welding steel pipe has high precision, uniform wall thickness, high external brightness of stainless steel pipe fittings (the surface brightness of the steel pipe determined by the surface grade of the steel plate), and can be arbitrarily measured. Therefore, it reflects its economy and aesthetics in high precision, medium and low pressure fluid applications.

Chemical Composition

Chemical Composition of Material	Material Composition	201	202	304	316L	430
	C	≤0.15	≤0.15	≤0.08	≤0.035	≤0.12
	Si	≤1.00	≤1.00	≤1.00	≤1.00	≤1.00
	Mn	5.5-7.5	7.5-10	≤2.00	≤2.00	≤1.00
	P	≤0.06	≤0.06	≤0.045	≤0.045	≤0.040
	S	≤0.03	≤0.03	≤0.030	≤0.030	≤0.030
	Cr	13-15	14-17	18-20	16-18	16-18
	Ni	0.7-1.1	3.5-4.5	8-10.5	10-14
	Mo				2.0-3.0

Mechanical Propert

Mechanical Property	Material Item	201	202	304	316
	Tensile Strength	≥535	≥520	≥520	≥520
	Yield Strength	≥245	≥205	≥205	≥205
	Extension	≥30%	≥30%	≥35%	≥35%
	Hardness (HV)	<105	<100	<90	<90