High Strength Nitrogenous Austenitic Stainless Steel

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Detail

Birth and development of QN High Strength Nitrogenous Austenitic Stainless Steel

QN series products are the first new austenitic stainless steel in the world. At present, there are five varieties —— QN1701, QN1803, QN1804, QN1906 and QN2109, about 15-30 PREN(Pitting Resistance Equivalent), equivalent to American standard 201/430, 304, 304L, from 316L to 317L. The product has the characteristics of high corrosion resistance, high strength, high wear resistance, easy processing, easy welding, etc. At the same time, the high nitrogen nickel design reduces the alloy cost and improves the technical added value of products, so it has the advantage of high cost performance. QN series products have become the national standard and the group standard of CISA（China Iron and Steel Association）. They are widely used in the fields of construction, decoration, kitchen and bathroom, products and Marine ranching, leading the innovation of stainless steel varieties and standards.

Product Standard

Publishing Unit	Standard no.	Grant standard Name	Application area
China Iron and Steel Association China Metallurgical information and standardization institute	T/CISA 045-2020	Cr - Mn - NI - N austenitic stainless steel hot-rolled sheet and strip	Plate and strip
	T/CISA 046-2020	Cr - Mn - NI - N austenitic stainless steel hot-rolled sheet and strip	Plate and strip

Chemical Composition (wt%)

Type	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	Nb+Ti	PREN
201J2	0.152	0.44	9.12	0.047	0.0025	13.15	1.25	0.03	0.36	0.167	/	9.14
430	0.042	0.32	0.25	0.028	0.001	16.15	0.12	0.01	0.04	0.040	/	16.18
QN1701	≤0.15	≤1.00	5.00- 8.00	≤0.06	≤0.010	16.00- 18.00	1.00- 2.00	≤0.6	0.80-3.00	0.20-0.30	/	＞15.0
304	0.040	0.40	1.05	0.035	0.0021	18.11	8.02	0.02	0.12	0.045	/	18.51
QN1803	≤0.10	≤1.00	4.00- 7.00	≤0.05	≤0.005	17.50- 19.50	2.00- 3.50	≤0.6	1.00-3.50	0.20-0.30	/	＞19.0
304L	0.020	0.42	1.02	0.034	0.0019	18.17	8.03	0.04	0.13	0.046		18.66
QN1804	≤0.06	≤1.00	4.00- 7.00	≤0.05	≤0.005	17.50- 19.50	3.00- 5.00	≤0.6	1.00-3.50	0.20-0.30		＞18.5
316L	0.021	0.4	1.25	0.032	0.001	16.6	10.05	2.04	0.1	0.035	/	23.13
QN1906	≤0.06	≤1.00	2.00- 5.00	≤0.045	≤0.005	18.00- 20.00	5.00- 7.50	0.50- 2.00	1.00-3.50	0.20-0.30	/	＞24.0
445J2	0.010	0.25	0.10	0.023	0.001	22.30	0.10	1.80	0.06	0.011	0.42	28.24
317L	0.016	0.38	1.45	0.026	0.001	18.12	12.66	3.05	0.08	0.044		28.89
QN2109	≤0.06	≤1.00	1.00- 4.00	≤0.045	≤0.005	20.00- 22.00	8.50- 10.50	1.00- 2.50	1.00-3.50	0.20-0.30		＞29.0

Chemical Composition

1. Physical Performance

Type	Density 3 (g/cm )	Specific Heat Capacity KJ/(kg*K)	Thermal Conductivity W/(m*K)	Thermal Diffusivity (mm2/s)	Coefficient of Thermal Expansion 10 /K	Electrical Resistivity Ω*mm2/m	Elasticity Modulus kN/mm2
201J2	7.81	0.65	20.6	4.06	16.5	0.67	195
430	7.75	0.46	26.0	/	10.5	0.60	200
QN1701	7.84	0.76	23.6	3.93	16.1	0.62	196
304	7.93	0.50	16.3	4.11	17.2	0.73	193
QN1803	7.83	0.67	20.7	3.96	16.8	0.72	196
304L	7.90	0.50	16.3	/	16.8	0.73	193
QN1804	7.84	0.50	15.3	3.87	16.3	0.70	196
316L	7.98	0.50	16.3	/	16.0	0.74	193
QN1906	7.90	0.59	17.2	3.67	17.3	0.74	196
445J2	7.75	/	22.5	/	10.5	/	/
317L	7.98	0.50	14.4	/	16.5	0.79	200
QN2109	7.90	0.59	15.1	3.21	16.1	0.79	197

2. Mechanical Property

Type	Thickness mm	Tensile Strength Rm（MPa）	Yield Strength Rp0.2（MPa）	Elongation A50%	Hardness HV	180° Cold Bend
201J2	0.5	915	410	51.5	240	Intact
430	0.5	540	285	31.5	145	Intact
QN1701	0.5	760	450	55.5	240	Intact
304	0.5	670	290	58.5	165	Intact
QN1803	0.5	747	432	51.6	230	Intact
304L	0.5	650	270	59.0	160	Intact
QN1804	0.5	735	425	52.5	215	Intact
316L	0.5	630	265	59.0	152	Intact
QN1906	0.5	742	420	49.5	210	Intact
445J2	0.5	550	360	30.5	175	Intact
317L	0.5	640	340	50.0	165	Intact
QN2109	0.5	720	415	48.5	196	Intact

3.Corrosivity

3.1Pitting Resistance

3.2 Sulfuric Acid Corrosion Resistance

3.3 Corrosion Resistance of Hydrochloric Acid

4. High Cost Performance

To sum up, QN series products have the following characteristics：

Strip Application Case

1. Building Roof and Curtain Wall

Cost Performance Advantage

(1.)Excellent corrosion resistance, especially in sulfuric acid, hydrochloric acid and other workshop environment, QN system corrosion resistance is stronger.

(2.)The yield strength exceeds Q355 grade, far higher than Q235 grade of conventional austenitic stainless steel, which can reduce the material thickness and further achieve lightweight products.

(3.)Cost performance is higher than conventional stainless steel roofing and curtain wall.

Recommend corresponding QN stainless steel grade.

2.Stainless Steel Purlin, Gutter

Cost performance advantage

(1) Excellent corrosion resistance. QN system has stronger corrosion resistance, especially in sulfuric acid, hydrochloric acid, acid rain industrial zone and other corrosion environment.

(2)Yield strength over Q355, far higher than the conventional austenitic stainless steel Q235, can reduce the thickness of the material, and further achieve lightweight products.

(3)The cost performance is higher than the conventional stainless steel used in purlin and gutter.

Recommend corresponding QN stainless steel grade.

3.Prefabricated Buildings

Cost Performance Advantage

(1)QN1804 has good brazing and corrosion resistance in the field of equipment construction.

(2)It has higher strength than 304 at room temperature and high temperature.In case of fire and other emergencies, the safety is higher.

Recommended material: QN1804

4 .Stainless Steel Decorative Welded Pipe

Cost Performance Advantage

(1)Excellent corrosion resistance overcomes the problems of the traditional decorative pipe material that is soft, low safety factor.

(2)Cost performance is higher than conventional stainless steel decorative welding pipe.
(3)Recommended materials: QN1701,QN1803

5.Drain Pipe and Fire Hose

Cost Performance Advantage

(1) High corrosion resistance, avoid corrosion failure in the process of long-term use. It is the advantage that traditional water pipe material does not have.
(2)Excellent high temperature strength. When fire hose contact with high temperature fire, it is more safe and effective for it will not soften too early,

(3)More cost-effective than conventional stainless steel drainpipes and fire hoses.

Recommended materials: QN1803, QN1804

6.Slide Rail Hinge

Cost performance advantage

(1)The corrosion resistance and strength of QN1803 are better than 304 steel, and the service life is greatly improved.
(2)Wear resistance is better than 304 steel grade, suitable for high-end door and window hinge products, with tens of thousands of times of push and pull without damage of high wear resistance.
(3)The cost performance is higher than that of conventional stainless steel for slide hinge.

Recommended material: QN1803

7.Hardware Door Industry

Cost Performance Advantage

(1) It has excellent corrosion resistance and overcome the weaknesses of traditional stainless steel, such as soft material, poor wind resistance, poor deformation resistance and so on.

(2)The cost performance is higher than that of conventional stainless steel used in hardware door industry.

Recommended materials: QN1701 & QN1803

8.The Panels of the Elevator

Cost Performance Advantage

(1)QN1803 has excellent corrosion resistance, high material hardness and easy polishing and wire drawing.

(2)It is used for elevator panel, which is more wear-resistant and scratch resistant.
(3)The cost performance is higher than that of conventional stainless steel for elevator panel.

Recommended material: QN1803

9.Tank

Cost Performance Advantage

(1)QN series is used in the water storage tank industry to ensure excellent corrosion resistance and longer service life.

(2)It has copper containing design, has significant antibacterial effect, has less risk of breeding bacteria in water storage, and is safer and healthier.

(3)The cost performance is higher than that of conventional stainless steel for water storage tank.

Recommended materials: QN1803 & QN1804

10.Kitchen and Bathroom Products

Cost Performance Advantage

(1)QN1803 has better corrosion resistance than 304 under the complex conditions of weak acid and salt commonly used in kitchens such as acetic acid + sodium chloride.

(2)QN1803 is better than 304 in pitting and crevice corrosion resistance. It is very suitable for making floor drains and other products with crevices.

(3)It meets the Japanese Standard JIS antibacterial standard, and the 4-hour sterilization rate reaches more than 99.9%.

(4)The migration test of heavy metals complies with national standards, EU standards and German LFGB.

Recommended materials: QN1803 & QN1804

11.Cookware Products

Cost Performance Advantage

(1)Its corrosion resistance under the common weak acid + salt compound condition in the kitchen is better than 304.

(2)It meets the Japanese Standard JIS antibacterial standard, and the 4-hour sterilization rate reaches more than 99.9%.

(3)Its heavy metal migration test complies with national standards, EU standards and German LFGB. It is a food grade cooking material.

Recommended materials: QN1803 & QN1804

12.Cold Container

Cost Performance Advantage

(1) QN1803 has higher pitting potential than 304, better Cl ion corrosion resistance and excellent corrosion resistance.

(2) Goodweld-ability and low temperature (-40 ℃) tensile properties.

Recommended material: QN1803

13.Live Stock Equipment

Cost Performance Advantage

(1) The livestock equipment made of QN1803 material ensures better corrosion resistance than 304.

(2) QN material has high strength, more resistant to livestock extrusion and arching, maintenance free, more environmental protection and longer service life.

Recommended materials: QN1803 (Trough) & QN1701（Fence）

14.Gas Pipeline

Cost Performance Advantage

(1) QN1803 has better corrosion resistance than 304 stainless steel, especially in S-containing corrosive environment.
(2) Under the same thickness specification, QN1803 has stronger negative pressure resistance, good welding performance and better wear resistance.

Recommended material: QN1803

15.Oceanic Ranch

Cost Performance Advantage

(1) QN series is used in the field of oceanic ranch to ensure excellent corrosion resistance and longer service life.

(2) The yield strength of QN material reaches 355MPa, which is more than 1.30 times that of 316L stainless steel. This ability to resist seawater erosion and wave attack is stronger.

(3) the cost performance is much higher than that of traditional marine pasture materials (wood and foam).

Recommended material: QN2109

16.Desulfurization column

Cost Performance Advantage

(1)The corrosion resistance of QN1803 in sulfuric acid environment is several times that of 304. Under the same conditions, the corrosion rate of 304 is more than 6 times that of QN1803. It is suitable for use in industrial environment containing sulfuric acid.
(2)Its cost performance is higher than that of traditional conventional materials for desulfurization tower.

Recommended material: QN1803

17.Chemical tank

Cost Performance Advantage

(1)QN series is used for chemical tank body to ensure excellent corrosion resistance and welding performance and longer service life.
(2)Its cost performance is higher than that of traditional conventional materials for chemical tank.

Recommended materials: QN1803, QN1804, QN1906 & QN2109.

Future Influence of Products

» Compared with the conventional steel with the same corrosion resistance, QN series can reduce the production cost by more than 20%.

» Compared with conventional steels with the same corrosion resistance, QN series gradually replaces some traditional high nickel and high cost austenitic stainless steels by virtue of its perfect combination of strength, corrosion resistance and cost performance.

» It will become the mainstream product series of stainless steel in the future and lead the innovation direction of stainless steel varieties.