Austenitic stainless steel, steel tube thereof and manufacturing method thereof

Abstract

The present invention relates to an austenitic stainless steel, a steel tube thereof and a manufacturing method thereof, wherein the austenitic stainless steel and the stainless steel tube comprise the components by mass percent: equal to or more than 0.070% and less than or equal to 0.09% of C, more than 0 and less than or equal to 0.30% of Si, 0.50-1.00% of Mn, less than 0.025% of P, less than 0.005% of S, 17.50-18.50% of Cr, 8.50-9.50% of Ni, 2.80-3.30% of Cu, 0.40-0.60% of Nb, 0.15-0.25% of Mo, 0.15-0.25% of Co, 0.080-0.130% of N, 0.003-0.008% of B, the rest of Fe and unavoidable impurity. The manufacturing method of the steel tube comprises: smelting and pouring to form steel ingots or continuously cast bloom, processing bar material, preparing tubular billet and further processing the steel tube; the method comprises the steps: the heating temperature of processing the bar material is 1250-1270 DEG C, heating temperature of preparing the tubular billet is 1100-1220 DEG C, and the finished product solid solution temperature is 1120-1190 DEG C. The austenitic stainless steel tube has high temperature creep strength and corrosion resisting performance at the high temperature.

Description

technical field

[0001] The invention relates to an austenitic stainless steel, a steel pipe and a method for manufacturing the steel pipe. Background technique

[0002] Among various energy resources in my country, coal resources are the most abundant. Coal-fired thermal power generation units account for more than 75% of the total capacity of generating units, occupying a dominant position. In recent years, with the rapid development of my country's national economy, the demand for electricity has also increased significantly. The development of high-parameter, large-capacity ultra-supercritical power generation technology has become the only way for my country's thermal power units to improve energy utilization and reduce pollutant emissions. However, increasing the parameters and capacity of thermal power units puts forward very high requirements on the heat-resistant materials used, especially the components with the highest operating temperature and the harshest operat...

Examples

Embodiment 1

[0085] The composition mass percent of this austenitic stainless steel embodiment is:

[0086] C 0.080% Si 0.25% Mn 0.80% P0.015% S<0.001%

[0087] Cr 18.10% Ni 9.0% Cu 3.0% Nb 0.45% Mo 0.20%

[0088] Co 0.18% N 0.011% B 0.005 The rest is Fe and unavoidable impurities.

Embodiment 2

[0090] The composition mass percent of this austenitic stainless steel embodiment is:

[0091] C 0.08% Si 0.19% Mn 0.72% P 0.0012%

[0092] S 0.002% Cr 18.32% Ni 9.11% Cu 2.88%

[0093] Nb 0.52% Mo 0.19% Co 0.22% N 0.095%

[0094] B 0.004%, the rest is Fe and unavoidable impurities.

[0095] Example 1 of austenitic stainless steel seamless steel pipe

[0096] The specifications of this austenitic stainless steel seamless steel pipe embodiment are Φ54×8mm, and the length is 10000mm, and its composition mass percentage is:

[0097] C 0.080% Si 0.25% Mn 0.80% P0.015% S<0.001%

[0098] Cr 18.10% Ni 9.0% Cu 3.0% Nb 0.45% Mo 0.20%

[0099] Co 0.18% N 0.011% B 0.005 The rest is Fe and unavoidable impurities.

[0100] Example two of austenitic stainless steel seamless steel pipe

[0101] The specifications of this austenitic stainless steel seamless steel pipe embodiment are Φ54×8mm, and the length is 10000mm, and its composition mass percentage is:

[0102] C 0.08% Si 0.19% M...

technical field

[0001] The invention relates to an austenitic stainless steel, a steel pipe and a method for manufacturing the steel pipe. Background technique

[0002] Among various energy resources in my country, coal resources are the most abundant. Coal-fired thermal power generation units account for more than 75% of the total capacity of generating units, occupying a dominant position. In recent years, with the rapid development of my country's national economy, the demand for electricity has also increased significantly. The development of high-parameter, large-capacity ultra-supercritical power generation technology has become the only way for my country's thermal power units to improve energy utilization and reduce pollutant emissions. However, increasing the parameters and capacity of thermal power units puts forward very high requirements on the heat-resistant materials used, especially the components with the highest operating temperature and the harshest operat...

Examples

Embodiment 1

[0085] The composition mass percent of this austenitic stainless steel embodiment is:

[0086] C 0.080% Si 0.25% Mn 0.80% P0.015% S<0.001%

[0087] Cr 18.10% Ni 9.0% Cu 3.0% Nb 0.45% Mo 0.20%

[0088] Co 0.18% N 0.011% B 0.005 The rest is Fe and unavoidable impurities.

Embodiment 2

[0090] The composition mass percent of this austenitic stainless steel embodiment is:

[0091] C 0.08% Si 0.19% Mn 0.72% P 0.0012%

[0092] S 0.002% Cr 18.32% Ni 9.11% Cu 2.88%

[0093] Nb 0.52% Mo 0.19% Co 0.22% N 0.095%

[0094] B 0.004%, the rest is Fe and unavoidable impurities.

[0095] Example 1 of austenitic stainless steel seamless steel pipe

[0096] The specifications of this austenitic stainless steel seamless steel pipe embodiment are Φ54×8mm, and the length is 10000mm, and its composition mass percentage is:

[0097] C 0.080% Si 0.25% Mn 0.80% P0.015% S<0.001%

[0098] Cr 18.10% Ni 9.0% Cu 3.0% Nb 0.45% Mo 0.20%

[0099] Co 0.18% N 0.011% B 0.005 The rest is Fe and unavoidable impurities.

[0100] Example two of austenitic stainless steel seamless steel pipe

[0101] The specifications of this austenitic stainless steel seamless steel pipe embodiment are Φ54×8mm, and the length is 10000mm, and its composition mass percentage is:

[0102] C 0.08% Si 0.19% M...

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