CN104087854A

CN104087854A - Martensite stainless steel material

Info

Publication number: CN104087854A
Application number: CN201410268989.4A
Authority: CN
Inventors: 范献兵; 孙允龙
Original assignee: Jiangsu Jinshi Casting & Forging Co Ltd
Current assignee: Jiangsu Jinshi Casting & Forging Co Ltd
Priority date: 2014-06-17
Filing date: 2014-06-17
Publication date: 2014-10-08

Abstract

The invention discloses a martensite stainless steel material 410SS(12Cr13). The martensite stainless steel material 410SS(12Cr13) comprises, by mass, 0.08-0.15% of C, 0.20-0.50% of Si, 0.40-0.80% of Mn, 11.70-13.50% of Cr, 0.40-0.60% of Ni, 0.20-0.30% of Mo, 0.025% or less of P, 0.025% or less of S, 2ppm or less of H, 30ppm or less of O, 200ppm or less of N, and the balance Fe. The adjustment of chemical component ranges maintains the hardness of the material in a required range, greatly increases the hardenability, and makes the strength and the impact toughness of the material reach expected effects. When the hardness is in a range of 197-235HBS, the mechanical performances of 410SS(12Cr13) body test bars are characterized in that the tensile strength is not less than 655MPa, the yield strength is not less than 517MPa, the elongation rate is not less than 17%, the section shrinkage rate is not less than 35%, and the impact value at -46DEG C is not less than 27J.

Description

Martensite Stainless Steel steel

Technical field

The present invention relates to a kind of Martensite Stainless Steel steel 410SS(12Cr13), be the Martensite Stainless Steel steel that meet 410 material requirements of USS and the 12Cr13 of China national stainless steel standard requirement specifically.

Background technology

In U.S. material standard, the chemical composition scope (mass percent %) of 410 materials is: carbon C≤0.15, silicon Si≤1.00, manganese Mn≤1.00, chromium Cr:11.50～13.50, phosphorus P≤0.040, sulphur S≤0.030.

Chemical composition scope (mass percent %) to 12Cr13 material in CNS is: carbon C≤0.08～0.15, silicon Si≤1.00, manganese Mn≤1.00, chromium Cr:11.50～13.50, nickel≤0.60, phosphorus P≤0.040, sulphur S≤0.030, other residual element summation≤1.0.

At present, 410 common materials or 12Cr13 material can not ensure the requirement of mechanical property and low-temperature impact toughness at the manufacture view of oil, Sweet natural gas drilling-production equipment, especially low-temperature flexibility, and use the material of other high-strong toughness instead, be that erosion resistance can ensure, or be that material cost is too high.

Summary of the invention

The object of the invention is: a kind of Martensite Stainless Steel steel 410SS(12Cr13 is provided), these steel meet the raw materials used chemical composition of oil and natural gas drilling product that API specifies and the requirement of mechanical property, also can ensure the impelling strength requirement of client under low temperature environment simultaneously, material cost is not high, can not only be used for the manufacture of oil, Sweet natural gas drilling aspect equipment, also can be for Other Engineering field.

Technical solution of the present invention is: the chemical composition mass percent % of these steel is: carbon C:0.08～0.15, silicon Si:0.20～0.50, manganese Mn:0.40～0.80, chromium Cr:11.70～13.50, nickel: 0.40～0.60, molybdenum Mo:0.20～0.30, phosphorus P≤0.025, sulphur S≤0.025, hydrogen H≤2ppm, oxygen O≤30ppm, nitrogen N]≤200ppm, all the other F _e.

Above-mentioned steel adopt EAF+LF+VD/VOD oxidation style to smelt, and smelting comprises the following steps:

Step 1, at EAF station, the furnace charge being made up of ordinary scrap steel adds in electric arc furnace, power transmission melting batch carries out dephosphorization treatment according to P constituent content situation, oxidation continues slag making and stream slag after skimming, and is warming up to 1650 DEG C of sampling analysis, requires P≤0.005%;

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 6-7.5%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.05-0.08%;

Step 3, the pre-deoxidation in 5-7 minute of use mid-carbon fe-mn pool boiling, then add carborundum powder to make reducing slag, after slag variable color, sample total analysis, tentatively adjust chemical composition to specification lower limit;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 0.8-1.0Kg to force deoxidation, and temperature is controlled at 1620-1660 DEG C and taps to LF station;

Step 5, at LF station, connect argon gas Argon and stir, heat temperature raising is also added slag charge, under good white slag, the recovery time is no less than 35 minutes, sampling analysis after slag is white, adjusts the middle limit of chemical composition to specification;

Step 6, temperature are controlled at 1650-1670 DEG C of bull ladle and proceed to VD station, ladle enters VD station and feeds Al line, connect argon gas soft blow argon, closing lid vacuumizes, vacuum tightness≤67 Pa, Argon pressure 0.2～0.3MPa, vacuum dwell time >=15 minute, after vacuum breaker, according to molten steel si content Ca Si wire feeding, sampling analysis, adjusts the upper limit of chemical composition to specification;

Step 7, temperature are controlled at 1590-1610 DEG C of bull ladle cast steel ingot, keep argon gas to connect in casting process.

The present invention has the following advantages:

1, the chemical composition of steel of the present invention both can meet the chemical composition requirement of U.S. material 410, can meet again the chemical composition scope of CNS.

2, the mechanical property of steel of the present invention is: tensile strength >=655MPa, yield strength >=517MPa, unit elongation >=17%, relative reduction in area >=35%, the impact value >=27J of-46 DEG C.

Embodiment

Further illustrate technical solution of the present invention below in conjunction with specific embodiment, these embodiment can not be interpreted as it is the restriction to technical scheme.

Embodiment 1: produce steel according to following concrete steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 6%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.05%;

Step 3, the pre-deoxidation in 5 minutes of use mid-carbon fe-mn pool boiling, then add carborundum powder to make reducing slag, after slag variable color, sample total analysis, tentatively adjust chemical composition to specification lower limit;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 0.8Kg to force deoxidation, and temperature is controlled at 1620 DEG C and taps to LF station;

Step 6, temperature are controlled at 1650 DEG C of bull ladles and proceed to VD station, ladle enters VD station and feeds Al line, connect argon gas soft blow argon, closing lid vacuumizes, vacuum tightness≤67Pa, Argon pressure 0.2MPa, vacuum dwell time >=15 minute, after vacuum breaker, according to molten steel si content Ca Si wire feeding, sampling analysis, adjusts the upper limit of chemical composition to specification;

Step 7, temperature are controlled at 1590 DEG C of bull ladle cast steel ingots, keep argon gas to connect in casting process.

Embodiment 2: produce steel according to following concrete steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 6.5%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.06%;

Step 3, the pre-deoxidation in 6 minutes of use mid-carbon fe-mn pool boiling, then add carborundum powder to make reducing slag, after slag variable color, sample total analysis, tentatively adjust chemical composition to specification lower limit;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 0.85Kg to force deoxidation, and temperature is controlled at 1630 DEG C and taps to LF station;

Step 6, temperature are controlled at 1660 DEG C of bull ladles and proceed to VD station, ladle enters VD station and feeds Al line, connect argon gas soft blow argon, closing lid vacuumizes, vacuum tightness≤67 Pa, Argon pressure 0.25MPa, vacuum dwell time >=15 minute, after vacuum breaker, according to molten steel si content Ca Si wire feeding, sampling analysis, adjusts the upper limit of chemical composition to specification;

Step 7, temperature are controlled at 1595 DEG C of bull ladle cast steel ingots, keep argon gas to connect in casting process.

Embodiment 3: produce steel according to following concrete steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 7.0%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.07%;

Step 3, the pre-deoxidation in 7 minutes of use mid-carbon fe-mn pool boiling, then add carborundum powder to make reducing slag, after slag variable color, sample total analysis, tentatively adjust chemical composition to specification lower limit;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 0.9Kg to force deoxidation, and temperature is controlled at 1640 DEG C and taps to LF station;

Step 6, temperature are controlled at 1670 DEG C of bull ladles and proceed to VD station, ladle enters VD station and feeds Al line, connect argon gas soft blow argon, closing lid vacuumizes, vacuum tightness≤67 Pa, Argon pressure 0.3MPa, vacuum dwell time >=15 minute, after vacuum breaker, according to molten steel si content Ca Si wire feeding, sampling analysis, adjusts the upper limit of chemical composition to specification;

Step 7, temperature are controlled at 1600 DEG C of bull ladle cast steel ingots, keep argon gas to connect in casting process.

Embodiment 4: produce steel according to following concrete steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 7.5%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.08%;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 0.95Kg to force deoxidation, and temperature is controlled at 1650 DEG C and taps to LF station;

Step 7, temperature are controlled at 1610 DEG C of bull ladle cast steel ingots, keep argon gas to connect in casting process.

Embodiment 5: produce steel according to following concrete steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, ensure molten clear rear Cr content 7%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.08%;

Step 4, add the lime slag making again through baking, simultaneously molten steel per ton adds aluminium ingot 1.0Kg to force deoxidation, and temperature is controlled at 1660 DEG C and taps to LF station;

The chemical composition of above-described embodiment 1-5 is as table 1.

Table 1 example chemical composition (mass percent %)

Sequence number	C	Si	Mn	P	S	Cr	Ni	Mo
									Internal control	0.08～0.15	0.20～0.50	0.40～0.80	≤0.025	≤0.025	11.70～13.50	0.20～0.30	0.20～0.30
1#	0.11	0.27	0.55	0.022	0.007	12.59	0.51	0.23
									2#	0.13	0.28	0.59	0.022	0.004	12.17	0.46	0.21
3#	0.13	0.29	0.52	0.022	0.006	12.25	0.49	0.22
									4#	0.13	0.29	0.55	0.025	0.003	12.27	0.50	0.23
5#	0.11	0.29	0.56	0.019	0.007	12.19	0.45	0.22

Steel coupon to embodiment 1-5 carries out following thermal treatment, is specially: do forging by steel coupon, annealing and roughing; Be heated to 850 DEG C of insulation 1.8～2.4min/mm, be warming up to 1000～1020 DEG C and continue insulation 1.2～1.8min/mm; Oil or water-based hardening liquid are cooling, are chilled to 150～250 DEG C of air coolings of coming out of the stove of material temperature, and air cooling to 50～100 DEG C are entered stove and carried out the 1st tempering, 710～740 DEG C of tempering temperatures, soaking time 1.8～2.4min/mm; The air cooling to 650 DEG C of coming out of the stove carries out oil or water-cooled below, is chilled to enter again stove after room temperature and carry out the 2nd tempering, and 700～730 DEG C of tempering temperatures, soaking time 1.8～2.4min/mm, comes out of the stove air-cooled.After thermal treatment, the mechanical property of forging and impelling strength are in table 2.

Table 2 example mechanical property and impelling strength

Claims

1. Martensite Stainless Steel steel 410SS(12Cr13), it is characterized in that: its chemical composition mass percent % is: carbon C:0.08～0.15, silicon Si:0.20～0.50, manganese Mn:0.40～0.80, chromium Cr:11.70～13.50, nickel: 0.40～0.60, molybdenum Mo:0.20～0.30, phosphorus P≤0.025, sulphur S≤0.025, hydrogen H≤2ppm, oxygen O≤30ppm, nitrogen N]≤200ppm, all the other F _e.

2. Martensite Stainless Steel steel 410SS(12Cr13 according to claim 1), it is characterized in that: these steel adopt EAF+LF+VD/VOD oxidation style to smelt, and smelting comprises the following steps:

After step 2, dephosphorization treatment, skim, again slag making; After slag blanket forms, first add the low-phosphorous high carbon ferro-chrome through baking, make molten clear rear Cr content 6-7.5%; Add a small amount of ferrosilicon, oxygen blast is fluxed again, and treats that low-phosphorous high carbon ferro-chrome all melts, and molten steel temperature reaches 1600 DEG C of rear oxidation decarburizations, oxygen blast terminal hour sampling analysis, and end point carbon is controlled at 0.05-0.08%;

Step 6, temperature are controlled at 1650-1670 DEG C of bull ladle and proceed to VD station, ladle enters VD station and feeds Al line, connect argon gas soft blow argon, closing lid vacuumizes, vacuum tightness≤67Pa, Argon pressure 0.2～0.3MPa, vacuum dwell time >=15 minute, after vacuum breaker, according to molten steel si content Ca Si wire feeding, sampling analysis, adjusts the upper limit of chemical composition to specification;