T11 Alloy Steel Pipe

T11 Tube Material is a low alloy ferritic stainless steel. There are carbon, silicon, manganese, nickel, phosphorus, chromium, sulfur and molybdenum in the content. The 0.5% carbon and 1% chromium bring the T11 Tube Material the good strength and corrosion resistance properties.

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Product Details

T11 Alloy Steel Pipe

Specifications	Wall thickness	1mm~120mm
	Outside diameter	6mm~2500mm
	Length	5.8m, 6m, 11.8m, 12m, or as required.
Surface		Black painted, PE coated, HDPE, Varnished,

Seamless Ferritic and austenitic alloy tubes for boilers, superheaters and heat exchangers	ASME SA-213/SA-213M	T2,T5,T11,T12,T22,T91
Seamless Ferritic Alloy Steel nominal pipe for high temperature service	ASME SA-335/SA-335M	P2,P5,P11,P12,P22,P36,P9,P91,P92

Chemical composition:

Grade	C	Mn	Si	Cu	Cr	P	S	Ni
T11	1.05～1.14	≤0.40	≤0.35	≤0．30、≤0．20	≤0．25、≤0．10	0.035	≤0.030	≤0．20、≤0．12

Mechanical properties：

Hardness: annealed state, ≤207HB, indentation diameter ≥ 4.20mm; Quenching, p 62 HRC

Specification for ordinary annealing:

Retreat temperature 750 ~760°C, holding 2 ~4h, and then to & LT; The cooling rate of 30°C/h, with the furnace cold to 500~600°C, out of the air cooling.

Specification for isothermal spheroidization annealing

1.750~760°C×2 --4h, 680~700°C ×4 ~6h, refurnace cold to 500~600°C, furnace air cooling, hardness ≤197HBW.

2.750~770°C ×1~2h, 680 ~700°C×2 ~3h, hardness 163 ~197HBW, pearlite organization 1-5.

Conditioning and tempering treatment specifications

Quench temperature 790 ~810°C, oil cooling, return temperature 640 ~680°C, holding 2 ~ 3h, hardness 183 ~207HBW.

Specification for quenching and tempering

Quench temperature 760~780°C, water cooling, oil double liquid cooling or alkali bath cooling, hardness ≤62HRC, return temperature