CN103100562B

CN103100562B - Method of machining special passivated stainless steel surface

Info

Publication number: CN103100562B
Application number: CN201110351419.8A
Authority: CN
Inventors: 郑涛; 杜海宪; 洪流; 戴科栋; 刘亚军
Original assignee: Ningbo Baoxin Stainless Steel Co Ltd
Current assignee: Ningbo Baoxin Stainless Steel Co Ltd
Priority date: 2011-11-09
Filing date: 2011-11-09
Publication date: 2015-04-01
Anticipated expiration: 2031-11-09
Also published as: CN103100562A

Abstract

The invention relates to a method of machining a special passivated stainless steel surface. The method includes a first step of cold rolling raw materials, rolling by adopting roller with 2.0 micrometers to 3.0 micrometers of roughness Ra, controlling cold rolling reduction rate within 5% to 10%, controlling rolling lubrication oil amount within 2000 liters per minute to 4000 liters per minute, a second step of passivating cold rolled materials, conducting annealing and pickling on cold rolled surfaces, controlling furnace temperature of an annealing furnace within 350 DEG C to 550 DEG C, controlling ratio of acid liquid in an acid groove to be 10 grams per liter to 25 grams per liter of hydrofluoric acid (HF) to 80 grams per liter to 200 gram per liter of hydrogen nitrate (HNO3), controlling pickling passivation temperature within 40 DEG C to 60 DEG C, and controlling running speed within 25 meters per minute to 40 meters per minute. Due to the facts that machining is conducted with the help of devices in a stainless steel enterprise and similar products are produced without need of additionally configuring a surface coating production line, production cost is greatly saved. Due to the fact that production technology process is relatively simple and controllable, production efficiency is high. Due to the fact that corrosion resistance of the surfaces which are pickled and passivated is greatly improved, stability is good.

Description

The processing method of the special passivated surface of a kind of stainless steel

Technical field

The present invention relates to the processing method of the special passivated surface of a kind of stainless steel.

Background technology

In the product category of stainless steel cold-rolled plate, there is the special surface that a class production difficulty is higher, require that surface roughness and glossiness control simultaneously, such as at track Vehicle Industry, the material surface roughness requirements being used as Side fascia controls at 0.8-1.2um (micron), glossiness (@60.) require between 25-45.In the past by this type of material of external import, in production technology, general is all use dull roll rolling, and then carry out resin-coating, to control roughness and the glossiness of final products, the shortcoming of this technique is very high to the ratio requirement of resin solution, and speed of production is slow, poor stability, and for traditional stainless steel enterprises, must configuration surface coating production line in addition.

Summary of the invention

Technical problem to be solved by this invention is to provide the processing method of the special passivated surface of a kind of stainless steel, has that processing technology is simply controlled, production efficiency is high, the feature of corrosion resistance and good.

The present invention solves the problems of the technologies described above adopted technical scheme: the processing method of the special passivated surface of a kind of stainless steel, it is characterized in that step is:

1) carry out cold rolling to raw material: take roughness Ra to be that the roller of 2.0-3.0um is rolled, cold rolling reduction ratio controls at 5-10%, and rolling lubrication oil mass controls at 2000-4000L/Min;

2) passivation is carried out to cold rolling rear material: annealing and pickling is carried out on cold rolling good surface, and the furnace temperature of annealing furnace is at 350-550 DEG C, and in acid tank, the proportioning of acid solution is HF concentration 10-25g/L, HNO ₃concentration 80-200g/L, acid wash passivation temperature controls at 40 ~ 60 DEG C, and the speed of service of band steel controls at 25-40mpm.

Finally, described step 1) in mill speed remain on below 200mpm, the unit tension of milling train is assigned as, forward pull 16 ~ 20kg/mm ², backward pull is 14 ~ 18kg/mm ².

Compared with prior art, the invention has the advantages that: the equipment by stainless steel enterprises inside is processed, and produces like product, need not configuration surface coating production line in addition, greatly save production cost; And the technological process of production of the present invention is comparatively simply controlled, production efficiency is high, and the surface corrosion resistance in addition after acid wash passivation improves a lot, good stability.

Comparing from production efficiency, for the technique using surface application resin solution on stainless steel, is generally Discontinuous manufacture, spiral-plate process, hourly output be generally no more than 2 tons/time; And passivation processing technology mentioned in this article, even if by lowest manufactured speed produce, hourly output also can reach 25 tons/time more than.

Contrast from the decay resistance of material, for 301L steel grade, specification is the material of 1.5-2.5mm, the average time that the material of unpassivated process occurs to corrode under salt spray test condition is 400 hours, and is greater than 500 hours through the average time that the material of Passivation Treatment occurs to corrode under same salt spray test condition.Attached salt spray test condition:

Test basis	GB-T10125-1997
		Salt spray test type	5% neutral salt spray
Distilled water quality	≤ 30us/cm goes dried up
		NaCL quality	99.8% analysis is pure
Test temperature DEG C	35±1
		Pressure pot temperature DEG C	47±1
Compressed air pressure	1.00±0.01kg/c m ²

Be 0.8-1.2um by the product surface roughness of this processes, glossiness (@60.) be 25-45, mechanical properties data yield strength is greater than 550Mpa, and tensile strength is greater than 800Mpa, and percentage elongation is greater than 35%.

Detailed description of the invention

Below in conjunction with embodiment, the present invention is described in further detail.

Embodiment 1

The special passivated surface of to be material be 301 steel grades that this example is implemented, thickness of slab is 2.0mm, and surface roughness requirements controls at 0.8-1.0um, glossiness (@60.) require between 25-45.

Concrete implementation step is as follows:

1) carry out cold rolling to raw material:

When milling train is cold rolling, the roughness of roll controls at 2.0um, and cold rolling reduction ratio controls 6%, and rolling lubrication oil mass controls at 3500L/Min, and mill speed remains on below 200mpm, and the unit tension of milling train is assigned as, forward pull 18kg/mm ², backward pull is 16kg/mm ².

2) passivation is carried out to cold rolling rear material

When pickling is annealed, the furnace temperature of setting annealing furnace is in 450 (+/-50 DEG C), and stove section unit tension is 0.45 ~ 0.80kg/mm ², Acidwash solution proportioning in descaling bath: HF concentration 10-15g/L, HNO ₃concentration 120-150g/L, acid wash passivation temperature controls in 50 (+/-10 DEG C), and the speed of service of band steel controls at 25-30mpm.

Embodiment 2

The special passivated surface of to be material be 301 steel grades that this example is implemented, thickness of slab is 2.5mm, and surface roughness requirements controls at 1.0-1.2um, glossiness (@60.) require between 25-45.

Concrete implementation step is as follows:

1) carry out cold rolling to raw material:

When milling train is cold rolling, the roughness of roll controls at 2.5um, and cold rolling reduction ratio controls 6.5%, and rolling lubrication oil mass controls at 3000L/Min, and mill speed remains on below 200mpm, and the unit tension of milling train is assigned as, forward pull 18kg/mm ², backward pull is 16kg/mm ².

2) passivation is carried out to cold rolling rear material

When pickling is annealed, the furnace temperature of setting annealing furnace is in 450 (+/-50 DEG C), and stove section unit tension is 0.45 ~ 0.80kg/mm ², Acidwash solution proportioning in descaling bath: HF concentration 10-15g/L, HNO ₃concentration 120-150g/L, acid wash passivation temperature controls in 50 (+/-10 DEG C), and the speed of service of band steel controls at 30-40mpm.

Embodiment 3

The special passivated surface of to be material be 301 steel grades that this example is implemented, thickness of slab is 2.5mm, and surface roughness requirements controls at 1.2-1.5um, glossiness (@60.) require between 35-55.

Concrete implementation step is as follows:

1) carry out cold rolling to raw material:

When milling train is cold rolling, the roughness of roll controls at 3.0um, and cold rolling reduction ratio controls 6%, and rolling lubrication oil mass controls at 2500L/Min, and mill speed remains on below 150mpm, and the unit tension of milling train is assigned as, forward pull 20kg/mm ², backward pull is 18kg/mm ².

2) passivation is carried out to cold rolling rear material

When pickling is annealed, the furnace temperature of setting annealing furnace is in 450 (+/-50 DEG C), and stove section unit tension is 0.45 ~ 0.80kg/mm ², Acidwash solution proportioning in descaling bath: HF concentration 15-20g/L, HNO ₃concentration 130-150g/L, acid wash passivation temperature controls in 50 (+/-10 DEG C), and the speed of service of band steel controls at 20-30mpm.

Embodiment 4

The special passivated surface of to be material be 301 steel grades that this example is implemented, thickness of slab is 1.5mm, and surface roughness requirements controls at 1-1.2um, glossiness (@60.) require between 30-45.

Concrete implementation step is as follows:

1) carry out cold rolling to raw material:

When milling train is cold rolling, the roughness of roll controls at 2.5um, and cold rolling reduction ratio controls 6%, and rolling lubrication oil mass controls at 3000L/Min, and mill speed remains on below 150mpm, and the unit tension of milling train is assigned as, forward pull 20kg/mm ², backward pull is 18kg/mm ².

2) passivation is carried out to cold rolling rear material

When pickling is annealed, the furnace temperature of setting annealing furnace is in 450 (+/-50 DEG C), and stove section unit tension is 0.45 ~ 0.80kg/mm ², Acidwash solution proportioning in descaling bath: HF concentration 10-15g/L, HNO ₃concentration 130-150g/L, acid wash passivation temperature controls in 50 (+/-10 DEG C), and the speed of service of band steel controls at 20-30mpm.

Embodiment 5

The special passivated surface of to be material be 301 steel grades that this example is implemented, thickness of slab is 1.5mm, and surface roughness requirements controls at 1.2-1.5um, glossiness (@60.) require between 35-50.

Concrete implementation step is as follows:

1) carry out cold rolling to raw material:

When milling train is cold rolling, the roughness of roll controls at 3.0um, and cold rolling reduction ratio controls 6%, and rolling lubrication oil mass controls at 2000L/Min, and mill speed remains on below 150mpm, and the unit tension of milling train is assigned as, forward pull 20kg/mm ², backward pull is 18kg/mm ².

2) passivation is carried out to cold rolling rear material

When pickling is annealed, the furnace temperature of setting annealing furnace is in 450 (+/-50 DEG C), and stove section unit tension is 0.45 ~ 0.80kg/mm ², Acidwash solution proportioning in descaling bath: HF concentration 15-20g/L, HNO ₃concentration 140-150g/L, acid wash passivation temperature controls in 50 (+/-10 DEG C), and the speed of service of band steel controls at 20-25mpm.

Claims

1. a processing method for the special passivated surface of stainless steel, is characterized in that step is:

2. processing method according to claim 1, is characterized in that described step 1) in mill speed remain on below 200mpm, the unit tension of milling train is assigned as, forward pull 16 ~ 20kg/mm ², backward pull is 14 ~ 18kg/mm ².