Stainless steel square tube

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Stainless steel 201 304 square tube, durable, stainless steel square tube for building decoration Stainless steel square tube is a kind of h……

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Stainless steel 201 304 square tube, durable, stainless steel square tube for building decoration

Stainless steel square tube is a kind of hollow long steel, because the section is square, so it is called square tube. A large number of pipelines used to transport fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is light, so they are also widely used to manufacture mechanical parts and engineering structures.

Material grade
Duplex steel	2304、S31803、S32205、S32750、S32760
Nickel base compound Gold material	C276、400、600、601、625、800、800H、800HT、825
austenite stainless steel	304、304L、321、321H、316、316L、316H、316Ti、 316UG、316LMod、317L、310S、347H、314、904L、 254SMO

International Material grade

06Cr19Ni10、022Cr19Ni10、06Cr23Ni13、06Cr25Ni20

06Cr17Ni12Mo2、022Cr17Ni12Mo2、07Cr17Ni12Mo2

06Cr17Ni12Mo2Ti、022Cr19Ni13Mo3、06Cr18Ni11Ti.

07Cr19Ni11Ti、06Cr18Ni11Nb、07Cr18Ni11Nb、022Cr22Ni5Mo3N

、022Cr23Ni5Mo3N、022Cr25Ni7Mo4N、022Cr25Ni7Mo4WCuN

PRODUCT SPECIFICATIONS
Stainless steel square tube	Side length: Φ 20mm~250mm x wall thickness: 1mm~15mm
Stainless steel seamless pipe	Outer diameter: Φ 3mm~1050mm x wall thickness: 0.3mm~60mm
Stainless steel welded pipe	Outer diameter: Φ 19mm~2200mm x wall thickness: 0.5mm~30mm

Executive standards
Stainless steel flange	ASME B 16.5，16.7、GB 9119-2010 、HG/T 20592-2009
Stainless steel pipe	GB/T14976-2012、GB/T 14975-2012、GB 13296-2017、 GB/T 21883-2008、ASTM A312、ASTM A213、ASTM A269、ASTM A511、EN 10216-5
Stainless steel pipe fittings	GB/T12459,13401.SH3408.3409、 ASME/ANSI B16.9,B16.28 、ASTM A403,MSS SP-43、 DIN 2605. 2609.2615.2616、JIS B2311,B2312, B2313

Product classification/use

06Cr19Ni10(304)

06Cr19Ni10) 304 stainless steel is an austenitic stainless steel. It is a steel developed on the basis of the 18-8 austenitic stainless steel originally invented. It is the main steel type of stainless steel, and its output accounts for more than 30% of the total output of stainless steel. Because this steel has austenitic structure

It can not be strengthened by heat treatment, and can only be strengthened by cold deformation. The austenitic structure of steel endows it with good cold and hot workability, non magnetism and good low temperature properties. The thin section size weldment of 304 stainless steel has sufficient intergranular corrosion resistance, excellent corrosion resistance in oxidizing acid, and better corrosion resistance in alkali banyan solution, most organic and inorganic acids, atmosphere and water vapor.

The good performance of (06Cr19Ni10) 304 stainless steel makes it the most widely used stainless steel brand with the largest application amount. This steel is suitable for manufacturing deep drawn parts and pipes, containers, structural parts, etc. for transporting corrosive media. 304 stainless steel can also be used for manufacturing nonmagnetic low temperature equipment and components.

1 chemical composition

Standard name	(06Cr19Ni10) 304 stainless steel chemical composition%
Standard name	C	Si	Mn	P	S	Ni	Cr	Cu	N
GB/T14976-12 06Cr19Ni10	≤0.08	≤1.00	≤2.00	≤0.035	≤0.030	8.0~11.0	18.0~20.0	–	–
ASTM A182/182 M F304	≤0.08	≤1.00	≤2.00	≤0.045	≤0.030	8.0~11.0	18.0~20.0	–	–
ASTM A666 A473	≤0.08	≤0.75	≤2.00	≤0.045	≤0.030	8.0~11.0	18.0~20.0	–	≤0.1
RCC-M3301/3306 3307 Z6CN 18-10	≤0.08	≤1.00	≤2.00	≤0.040	≤0.030	8.0~10.5	17.0~20.0	–	–
RCC-M3304 M3303	≤0.08	≤0.75	≤2.00	≤0.040	≤0.030	8.0~11.0	17.0~20.0	≤0.01	–
EN 10088-1 1.4301	≤0.07	≤1.00	≤2.00	≤0.045	≤0.015	8.0~10.5	17.5~19.5		≤0.11

2 Mechanical properties

Room temperature mechanical properties of 022Cr17Ni12Mo2 (316L) stainless steel in various standards
standard	Material type	state	Ò b/MPa	Ò 0.2/MPa	Ò 5/%	ф/%	HB
GB1220-92	Bar	Solid solution	≥480	≥177	≥40	≥60	≤90
GB4237-92	Hot rolled plate	Solid solution	≥480	≥177	≥40		≤90
ASTM A473 8 316L	forging	Solid solution	≥450	≥170	≥40	≥50
A276 316L	Heat-treat bar	Solid solution	≥480	≥170	≥40	≥50
	≤ Φ 13mm cold working bar	Solid solution	≥620	≥310	≥30	40
	≥ Φ 13mm cold working bar		≥515	≥170	≥30	≥50
A167、A240、316L	Tube, plate and strip	Solid solution	≥485	≥175	≥45/40

3 Corrosion resistance

Uniform corrosion resistance of (022Cr17Ni12Mo2) 316L stainless steel
Corrosive medium	Concentration%	Temperature ℃	Corrosion rate mm/a
sulphuric acid	0~30	25	<0.3
	10	0≤50	<0.3
	40	25	>0.3
	85	25	<0.3
	98	25-50	<0.3
phosphoric acid	40	70-100	<0.3
	40	boiling	<0.3
	50~60	70-100	<0.3
	50~60	boiling	>0.3
	70	70~90	<0.3
	70	100	>0.3
	80	70-80	<0.3
	80	>80	>0.3
Crude acetic acid		81	2.2
		190	14
	strong	boiling	<0.0005
Formic acid+acetic acid	20	boiling	0.26
	70	boiling	0.26
	20	boiling	0.401
	45	boiling	0.401
acetic acid	30	boiling	0.001
	50	boiling	0.005
	70	boiling	0.018
	99	boiling	0.035
Urea Melt	Urea 32~34	190~195	0.065
	Carbon dioxide 10-11
	Ammonia 35~36
	Water 19~21
Urea Melt	Carbon dioxide 35	170~180	0.024
	Ammonia 54~55
	Water 10
Urea Melt	Urea 30	188	0.17
	Methylamine 30
	Ammonia 20
	Water 20

4.Process performance

Both (06Cr17Ni12Mo2) 316 stainless steel and (022Cr17Ni12Mo2) 316L stainless steel have good cold and hot working properties. The steel has good thermoplasticity and low overheating sensitivity. The appropriate hot working temperature is 900~1200 ℃. Due to the high molybdenum content in the steel, its deformation resistance is significantly higher than that of 0Cr18Ni9 and 00Cr18Ni9 stainless steels.

The cold workability of the two steels is good, which can be used for cold rolling, cold drawing, deep drawing, bending, curling, cold processing and cold forming of folding stools.

The solution treatment temperature of the two brands is 1050~1100 ℃, and the cooling methods are water cooling and air cooling, which shall be determined according to the section size of the product. The structure of steel in solution state is austenite.

The two steels have good weldability. (06Cr17Ni12Mo2) 316 stainless steel manual welding electrode shall be austenitic 202, austenitic 201 or E316-15 (American brand). In order to maintain good intergranular corrosion resistance, solution treatment shall be carried out after welding. If heat treatment is not allowed, 022Cr17Ni12Mo2 shall be used. 316L stainless steel manual electrode is Ao022, which can be welded without heat treatment and still has good resistance to intergranular corrosion.

Product performance

Due to the good combination of mechanical properties and corrosion resistance of (022Cr17Ni12Mo2) 316L stainless steel, it is widely used in chemical processing industry, such as manufacturing synthetic fiber, petrochemical industry, textile, fertilizer, printing and dyeing and atomic energy industrial equipment, such as tower, tank, vessel and pipeline, heat exchanger, etc. It is suitable for manufacturing welding parts and equipment with large section size.

Processing capacity