CN103643148B - The formula of H-45 high-abrasive material and working method - Google Patents

Abstract

The formula of H-45 high-abrasive material and a working method, each element is filled a prescription by weight percentage and is: C≤0.07%, Cr26-28%,? Ni5-6%, Mo1.5-2%, Cu1.5-2.5%, V0.1-0.15%,? Re0.015%, all the other are Fe.Its procedure of processing is as follows: 1), first technically pure iron and ferrochrome are added furnace bottom, and energising fusing, treats that its temperature reaches more than 1350 DEG C, then add molybdenum-iron, nickel plate, copper, vanadium; 2), treat that furnace charge all melts, temperature carries out slag making after reaching 1550 DEG C again, removes detrimental impurity; 3), treat that temperature rises to 1560-1600 DEG C, abundant deoxidation and carry out rare earth denaturing treatment; 4), teeming temperature controls at 1560-1600 DEG C, and according to the size feature of foundry goods, design different cast gates and rising head, the amount of carrying feeding is in time to obtain complete foundry goods.Not only corrosion resistant and abrasion resistance are fine by thermal treatment for the material that the present invention produces, and material hardness HRC can reach more than 32-40, fully meets the requirement of wear resistant corrosion resistant in Desulfurization, and desulfur pump reaches more than two and half work-ing life.

Description

The formula of H-45 high-abrasive material and working method

Technical field

The present invention relates to material, particularly relate to a kind of formula and working method of H-45 high-abrasive material.

Background technology

High-abrasive material is the core of field of new, plays important promotion and supporting role to the development of new and high technology, and in global new material research field, high-abrasive material accounts for 85%.Along with the arrival of information society, the development of special, wear-resistant material to new and high technology plays important promotion and supporting role, be 21st century information, biology, the energy, environmental protection, the high-tech sector such as space critical material, becoming the emphasis of countries in the world field of new researchdevelopment, is also the focus of Strategic Competition in the high technology development of countries in the world.Desulfurization medium due to desulfur pump conveying is the singularity of the operating modes such as severe corrosive and particle wash away, so existing desulfur pump is very short for work-ing life, general one year, can not meet industrial development needs.

Summary of the invention

Object of the present invention is exactly formula and the working method that will provide a kind of H-45 high-abrasive material, and it can overcome the deficiency that prior art exists.The object of the present invention is achieved like this, and a kind of formula of H-45 high-abrasive material and working method, is characterized in that: each element is filled a prescription by weight percentage and is: C≤0.07%, Cr26-28%, Ni5-6%, Mo1.5-2%, Cu1.5-2.5%, V0.1-0.15%, Re0.015%, all the other are Fe.

Its working method, weighs by formula, and melting step is as follows:

1), first technically pure iron and ferrochrome are added furnace bottom, energising fusing, treats that its temperature reaches more than 1350 DEG C, then adds molybdenum-iron, nickel plate, copper, vanadium;

2), treat that furnace charge all melts, temperature carries out slag making after reaching 1550 DEG C again, removes detrimental impurity;

3), treat that temperature rises to 1560-1600 DEG C, abundant deoxidation and carry out rare earth denaturing treatment;

4), teeming temperature controls at 1560-1600 DEG C, and according to the size feature of foundry goods, design different cast gates and rising head, the amount of carrying feeding is in time to obtain complete foundry goods.

Heat treatment step is as follows:

1), first rationally loaded in heat treatment furnace by its structure, wall thickness situation, then fasten heat-preservation furnace door by the foundry goods after cleaning, power supply heats up.

2), when temperature rises to 450-550 DEG C, insulation 0.5-1.5 hour, then when being warming up to 750-780 DEG C, insulation 1-3 hour, then be warming up to 1000-1050 DEG C, be incubated after 5-7 hour, come out of the stove air-cooled.

3), after foundry goods fully cools, again enter stove Heating temperature to 550-600 DEG C, be incubated come out of the stove after 5-7 hour air-cooled.

The material that the present invention produces not only corrosion resistant and abrasion resistance is fine, adopt special thermal treatment process, tensile strength reaches 778MPa, yield strength reaches 551MPa, unit elongation 58%, material hardness HRC can reach 32-40, fully meets the requirement of wear resistant corrosion resistant in Desulfurization, and desulfur pump reaches more than two and half work-ing life.

Embodiment

The formula of H-45 high-abrasive material and a working method, is characterized in that: each element is filled a prescription by weight percentage and is: C≤0.07%, Cr26-28%, Ni5-6%, Mo1.5-2%, Cu1.5-2.5%, V0.1-0.15%, Re0.015%, and all the other are Fe.

Because this material chrome content is higher, required to material selection adding of strict control harmful element.

Its working method, weighs by formula, and melting step is as follows:

1), first technically pure iron and ferrochrome are added furnace bottom, energising fusing, treats that its temperature reaches more than 1350 DEG C, then adds molybdenum-iron, nickel plate, copper, vanadium;

2), treat that furnace charge all melts, temperature carries out slag making after reaching 1550 DEG C again, removes detrimental impurity;

3), treat that temperature rises to 1560-1600 DEG C, abundant deoxidation and carry out rare earth denaturing treatment;

4), teeming temperature controls at 1560-1600 DEG C, and according to the size feature of foundry goods, design different cast gates and rising head, the amount of carrying feeding is in time to obtain complete foundry goods.

Heat treatment step is as follows:

1), first by foundry goods spruing, cleaning undesirable root, overlap, burr, the foundry goods after cleaning rationally loads in heat treatment furnace by its structure, wall thickness situation, then fastens heat-preservation furnace door, and power supply heats up.

2), when temperature rises to 450-550 DEG C, insulation 0.5-1.5 hour, then when being warming up to 750-780 DEG C, insulation 1-3 hour, then be warming up to 1000-1050 DEG C, be incubated after 5-7 hour, come out of the stove air-cooled.

3), after foundry goods fully cools, again enter stove Heating temperature to 550-600 DEG C, be incubated come out of the stove after 5-7 hour air-cooled.

Because material chrome content is high, the factor such as casting section thickness and structure, need control temperature even during thermal treatment especially, prevent the outstanding difference of Yin Wendu large and make foundry goods easily produce the defects such as cracking.

H-45 is two-phase alloys, and in its solid solution structure, Α ferritic phase and Χ austenite are makeed an appointment and respectively accounted for half.Through analysis of experiments it break up current potential, protection potential, indoor chemical immersion test-results all proves that it has excellent resistance to pitting attack performance; Also prove that it has excellent general corrosion resistance and the performance of crevice corrosion simultaneously by test.

test results and analysis

1. indoor chemical immersion test

The pitting attack chemical immersion test of H-45 two-phase alloys is with the mixing solutions of iron trichloride+hydrochloric acid for feature, and wherein the corrosive nature of chlorion directly affects test result.304L stainless steel material is as a comparison have employed in test.Specimen size is 50mm × 25mm × 3mm, tests in the solution of 6%FeCl3, under the condition of 35 DEG C ± 1 DEG C, has carried out the soak test of 18 days altogether.Test-results is in table 1.Therefrom known H-45 two-phase alloys has excellent resistance to pitting attack performance.

Table 1 chemical immersion test-results;

Material	Average pitting penetration mm	Maximum pit depth mm	There is spot corrosion time h
				H-45	0	0	Spot corrosion is had no after 18 days
304L	1.27	Penetrate	5

Analyze:

It is consistent with the performance of other duplex stainless steels that H-45 two-phase alloys has excellent pitting resistance, and this is also the characteristic decision of duplex stainless steel.At present, stainless corrosion-resistant ability generally represents by spot corrosion index value (PRE), and PRE numerical value is larger, and resistance to pitting attack ability is stronger.

Table 2: the PRE value being several stainless material, shows that the resistance to pitting attack ability of H-45 two-phase alloys is much higher than other several stainless steels.In addition, from breaking up current potential (Eb) and protection potential (Ep) also can describe the problem, because breaking up current potential (Eb) is the potential value that metal starts to produce spot corrosion; And protection potential (Ep) is the current potential boundary that metal does not produce spot corrosion completely, that is can not there is spot corrosion lower than during protection potential in metal current potential, also can by passivation again even if there is point corrosion pit.The current potential that breaks up of H-45 two-phase alloys is+500mV, and protection potential is+308mV, and also higher than other stainless steel a lot, visible H-45 two-phase alloys has excellent resistance to pitting attack performance.

The spot corrosion index value of several stainless material of table 2;

(calculation formula: %Cr+3.3 × %Mo+16 × %N)

Steel grade	H-45	304L	316L
				PRE	35	25.9	30

2. general corrosion resistance performance

Test-results

Test sample is Φ 72mm annulus.The on-the-spot oil-reservoir water configuration of corrosive medium simulation oil field,

Composition is: Na ⁺+ K ⁺50000mg/L; Mg ²+ 1100mg/L; Ca ²+ 6500mg/L; Cl ^-97000mg/L; SO ₄ ^2-900mg/L; HCO ₃ ^-250mg/L; CO ₃ ^2-0mg/L.

Table 3 corrosion simulation environment differing materials average corrosion rate;

Material	1Cr18Ni9Ti	304L	H-45
				Average corrosion rate (mm/a) in liquid phase	0.015	0.006	0.001
Average corrosion rate (mm/a) in gas phase	0.008	0.028	0.000

Analyze:

From table 3, in desulfurization slurry corrosive environment, even if the whole submergence of material in aqueous, the conventional stainless average corrosion rate of 1Cr18Ni9Ti, 304L is all very low, and H-45 two-phase alloys material surface brighting as before, average corrosion rate in liquid and gas is nearly all zero, so H-45 two-phase alloys has excellent general corrosion resistance performance.

3. slit and corrosion resistant performance

Test-results

Test basis GB T10127-2002 " stainless steel iron trichloride crevice corrosion test method " carries out, and testing liquid is 10%FeCl3 6H2O, and test temperature is 22 DEG C ± 1 DEG C, and test period is 72h, pH=1 ~ 1.5.Test-results lists in table 4.

Several stainless crevice corrosion zero-G test result of table 4;

Steel grade	Weightless (g)
		H-45	0.52
304L	0.69

Analyze

As known from Table 4, H-45 two-phase alloys slit and corrosion resistant is stronger.

conclusion:

From above test and analysis, can draw to draw a conclusion: 1. H-45 two-phase alloys is compared with other stainless materials, there is more excellent resistance to pitting attack performance.2. H-45 two-phase alloys has the general corrosion resistance performance more excellent than other stainless materials in desulfurization corrosive environment.3. H-45 two-phase alloys is compared with other stainless materials, has more excellent slit and corrosion resistant performance.

4. special thermal treatment

H-45 adopts special thermal treatment process, material HRC can be made to reach 32-40, fully meet the working condition requirement of wear resistant corrosion resistant in Desulfurization.

5. mechanical characteristics:

Tensile strength, 778MPa;

Yield strength, 551MPa;

Unit elongation 58%.

Claims (2)

1. a formula for H-45 high-abrasive material, is characterized in that: each element is filled a prescription by weight percentage and is: C≤0.07%, Cr26-28%, Ni5-6%, Mo1.5-2%, Cu1.5-2.5%, V0.1-0.15%, Re0.015%, and all the other are Fe.

2. produce the working method of a kind of H-45 high-abrasive material of filling a prescription as claimed in claim 1, it is characterized in that: weigh by formula, melting, thermal treatment;

Wherein melting step is as follows:

1), first technically pure iron and ferrochrome are added furnace bottom, energising fusing, treats that its temperature reaches more than 1350 DEG C, then adds molybdenum-iron, nickel plate, copper, vanadium;

2), treat that furnace charge all melts, temperature carries out slag making after reaching 1550 DEG C again, removes detrimental impurity;

3), treat that temperature rises to 1560-1600 DEG C, abundant deoxidation and carry out rare earth denaturing treatment;

4), teeming temperature controls at 1560-1600 DEG C, and according to the size feature of foundry goods, design different cast gates and rising head, the amount of carrying feeding is in time to obtain complete foundry goods;

Heat treatment step is as follows:

1), first rationally loaded in heat treatment furnace by its structure, wall thickness situation, then fasten heat-preservation furnace door by the foundry goods after cleaning, power supply heats up;

2), when temperature rises to 450-550 DEG C, insulation 0.5-1.5 hour, then when being warming up to 750-780 DEG C, insulation 1-3 hour, then be warming up to 1000-1050 DEG C, be incubated after 5-7 hour, come out of the stove air-cooled;

3), after foundry goods fully cools, again enter stove Heating temperature to 550-600 DEG C, be incubated come out of the stove after 5-7 hour air-cooled.