CARBON STEEL AND AUSTENITIC STAINLESS STEEL ROLLING CLAD PLATE MANUFACTURING METHOD THEREFOR

Abstract

Disclosed in the present invention is a manufacturing method for a carbon steel and austenitic stainless-steel rolling clad plate, comprising the steps of: (1) obtaining a blank material of a carbon steel layer and a blank material of a stainless-steel layer; (2) assembling blank materials; (3) cladding and rolling; (4) cold rolling; (5) first annealing; and (6) second annealing. The carbon steel and austenitic stainless-steel rolling clad plate has two unique annealing processes, so that the clad plate has the performance advantages of the austenitic stainless-steel and the carbon steel. In addition, further disclosed in the present invention is a carbon steel and austenitic stainless-steel rolling clad plate manufactured by this method.

Claims

1. A manufacturing method for a rolled clad plate of carbon steel and austenitic stainless-steel, characterized in that, it comprises the following steps: (1) preparing a blank material of a carbon steel layer and a blank material of a stainless-steel layer; (2) assembling the blank materials; (3) clad rolling; (4) cold rolling; (5) first annealing: wherein the plate is annealed at an annealing temperature of 1050-1150° C. and a holding time of greater than or equal to 30 s; then cooled to room temperature, wherein in the cooling procedure, rapid cooling is performed in the temperature range of 900-500° C. with a cooling rate controlled to be 20-200° C./s; (6) second annealing: wherein the plate is heated at a heating rate greater than or equal to 5° C./s to a soaking temperature of 800-950° C., held for 10-100 s, and then cooled at a rate of v1=3-20° C./s to a rapid cooling starting temperature T of ≥800-10×v1, and then cooled at a rate of 20-1000° C./s to 150-450° C.; and then subjected to an overaging treatment, wherein the overaging temperature is 150-450° C. and the overaging treatment time is 100-400 s.

2. The manufacturing method according to claim 1, wherein, in step (3), the blank materials are heated to 1150-1260° C. and held for 0.6 hour or more, wherein the final rolling temperature is controlled to be greater than or equal to 850° C., the blank materials are cooled at a rate of 30-100° C./s after rolling and the coiling temperature is controlled to be 450-600° C.

3. The manufacturing method according to claim 1, wherein, in step (4), the cold rolling reduction rate was controlled to be 40-70%.

4. The manufacturing method according to claim 1, wherein the method further comprises step (7) of leveling.

5. The manufacturing method according to claim 1, wherein, in step (5), the holding time is 30-80 s and the cooling rate in the temperature range of 900-500° C. is 20-180° C./s.

6. The manufacturing method according to claim 1, wherein, in step (6), the heating rate is 5-20° C./s, v1=5-20° C./s.

7. The manufacturing method according to claim 2, wherein, in step (3), the holding time is 0.6-3 hours, and the final rolling temperature is 850-920° C.

8. The manufacturing method according to claim 1, wherein the carbon steel layer is a base layer, the austenitic stainless-steel is a cladding layer, and the carbon steel layer is single-side or double-side cladded with the cladding layer of austenitic stainless-steel.

9. The manufacturing method according to claim 1, wherein, when assembling the blank materials, the thickness ratio of the carbon steel layer to each layer of the austenitic stainless-steel layers is 5-30:1.

10. A rolled clad plate of carbon steel and austenitic stainless-steel manufactured by the manufacturing method according to claim 1.

11. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 10, characterized in that, the austenitic stainless-steel layer comprises the following chemical elements in mass percentages: C: 0.02%-0.15%, Si: 0.3%-1.0%, Mn: 1.0-10.5%, Cr: 14.0-20.0%, Ni: 0.2-14.0%, N≤0.25%, Cu≤0.6%, Mo≤3.0%; and a balance of Fe and other unavoidable impurities.

12. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 11, wherein the carbon steel layer comprises the following chemical elements in mass percentages: C: 0.05%-0.35%, Si: 0.1%-2.0%, Mn: 0.5%-3.0%, Al: 0.01%-0.08%, and a balance of Fe and other unavoidable impurities.

13. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 12, wherein the carbon steel layer further comprises at least one of the following chemical elements: B≤0.005%, Nb≤0.1%, Ti≤0.15%, V≤0.15%, Cr≤0.6%, Mo≤0.3%.

14. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 10, wherein the rolled clad plate of carbon steel and austenitic stainless-steel has a tensile strength of 780-1700 MPa.

15. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 14, wherein the rolled clad plate of carbon steel and austenitic stainless-steel has a yield strength of 500-1400 MPa, a pitting corrosion potential of 0.25-0.45 V, and an intergranular corrosion of 0.25-0.40 Ra.

16. The manufacturing method according to claim 1, wherein, when assembling the blank materials, the thickness ratio of the carbon steel layer to each layer of the austenitic stainless-steel layers is 7-10:1.

17. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 11, wherein the rolled clad plate of carbon steel and austenitic stainless-steel has a tensile strength of 780-1700 MPa.

18. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 12, wherein the rolled clad plate of carbon steel and austenitic stainless-steel has a tensile strength of 780-1700 MPa.

19. The rolled clad plate of carbon steel and austenitic stainless-steel according to claim 13, wherein the rolled clad plate of carbon steel and austenitic stainless-steel has a tensile strength of 780-1700 MPa.

Description

DETAILED DESCRIPTION

[0056] The present disclosure will be further described with reference to the specific embodiments of the rolled clad plate of carbon steel and austenitic stainless-steel according to the present disclosure and the manufacturing method thereof to make a further explanation and description, however, the explanation and description does not constitute an improper limitation of the technical solution of the present disclosure.

EXAMPLES 1-6

[0057] The rolled clad plates of carbon steel and austenitic stainless-steel of Example 1-6 were prepared by the following steps:

[0058] (1) preparing a blank material of carbon steel layer and a blank material of a stainless-steel layer according to the composition shown in Table 1;

[0059] (2) assembling the blank materials;

[0060] (3) clad rolling: wherein the blank materials were heated to 1150-1260° C. and held for 0.6 hour or more, wherein the final rolling temperature was controlled to be greater than or equal to 850° C., the blank materials were cooled at a rate of 30-100° C./s after rolling and the coiling temperature was controlled to be 450-600° C.;

[0061] (4) cold rolling: wherein the cold rolling reduction rate was controlled to be 40-70%;

[0062] (5) first annealing: wherein the plate was annealed at an annealing temperature of 1050-1150° C. and a holding time of greater than or equal to 30 s; then cooled to room temperature, wherein in the cooling procedure, rapid cooling was performed in the temperature range of 900-500° C. with a cooling rate controlled to be 20-200° C./s;

[0063] (6) second annealing: wherein the plate was heated at a heating rate greater than or equal to 5° C./s to a soaking temperature of 800-950° C., held for 10-100 s, and then cooled at a rate of v1 =3-20° C./s, preferably 5-20° C./s to a rapid cooling starting temperature T of >800-10xv1, and then cooled at a rate of 20-1000° C./s to 150-450° C.; and then subjected to an overaging treatment, wherein the overaging temperature was 150-450° C. and the overaging treatment time was 100-400 s.

[0064] In some other embodiments, the manufacturing method also comprised Step (7) of leveling.

[0065] The mass percentages of each chemical element of the rolled clad plate of carbon steel and austenitic stainless-steel of Example 1-6 are shown in Table 1.

TABLE-US-00001 TABLE 1 (wt %, with a balance of Fe and other unavoidable impurities) No. Blank layer C Si Mn P S N Al B Example 1 Carbon steel layer 0.348 0.32 0.52 0.0082 0.0015 0.0036 0.034 0.0028 304L austenitic 0.023 0.32 1.32 0.0239 0.0019 0.052 — — stainless-steel layer Example 2 Carbon steel layer 0.199 0.109 1.58 0.0093 0.001 0.0035 0.028 0.0017 BN1H austenitic 0.147 0.96 10.23 0.029 0.0012 0.24 — — stainless-steel layer Example 3 Carbon steel layer 0.098 0.26 2.28 0.0067 0.001 0.003  0.0249 — 304 austenitic 0.045 0.42 1.24 0.032 0.0009 0.042 — — stainless-steel layer Example 4 Carbon steel layer 0.058 0.226 1.358 0.0104 0.003 0.0035  0.0775 0.0047 304 austenitic 0.045 0.42 1.24 0.032 0.0009 0.042 — — stainless-steel layer Example 5 Carbon steel layer 0.182 1.9 1.82 0.0104 0.003 0.0035  0.0375 — 316 austenitic 0.0776 0.69 1.92 0.0278 0.0012 0.098 — — stainless-steel layer Example 6 Carbon steel layer 0.12 0.35 2.91 0.0092 0.001 0.0028 0.024 — 316L austenitic 0.0216 0.48 1.42 0.0326 0.0021 0.058 — — stainless-steel layer No. Blank layer Ni Nb Ti V Cr Cu Mo Example 1 Carbon steel layer — — 0.025 — — — — 304L austenitic 8.19 — — — 18.3 — — stainless-steel layer Example 2 Carbon steel layer — — 0.012 — — — 0.11 BN1H austenitic 0.23 — — — 15.7 0.56 — stainless-steel layer Example 3 Carbon steel layer — — 0.021 —  0.55 — 0.22 304 austenitic 8.08 — — —  19.71 — — stainless-steel layer Example 4 Carbon steel layer — 0.095  0.1439 0.13 — — — 304 austenitic 8.08 — — —  19.71 — — stainless-steel layer Example 5 Carbon steel layer — — 0.012 — — — — 316 austenitic 13.86  — — — 17.8 — 2.05 stainless-steel layer Example 6 Carbon steel layer — — 0.015 — — — — 316L austenitic 10.06  — — — 16.3 — 2.88 stainless-steel layer

[0066] The specific process parameters of the rolled clad plate of carbon steel and austenitic stainless-steel of Example 1-6 are shown in Table 2-1 and Table 2-2.

TABLE-US-00002 TABLE 2-1 Step(2) (thickness ratio of Step(5) Austenitic Rapid stainless-steel Step(4) cooling layer:Carbon Step(3) Cold rate in the steel Final rolling temperature layer:Austenitic Heating Holding rolling Coiling reduction Annealing Holding range of stainless- temperature time temperature Cooling rate temperature rate temperature time 900-500° C. No. steel layer) (° C.) (h) (° C.) (° C./s) (° C.) (%) (° C.) (s) (° C./s) Example 1 0:10:1 1170 0.6 900 100 520 60 1050 80 20 Example 2 1:10:1 1230 1.3 920 70 550 40 1080 70 25 Example 3 1:8:1 1200 3 860 50 580 50 1100 60 180 Example 4 0:8.5:1 1230 2.5 880 30 600 70 1120 50 120 Example 5 1:5:1 1260 1.5 850 60 450 55 1130 40 35 Example 6 1:9:1 1150 2 890 80 500 45 1150 30 30 Example 7 0:30:1 1150 2 890 80 500 45 1150 30 30 Example 8 1:20:1 1150 2 890 80 500 45 1150 30 30

[0067] Note: the compositions of blank layer of Examples 7 and 8 are the same as those of Examples 1 and 2; in each Example, the thickness of each layer is recorded in unit of mm.

TABLE-US-00003 TABLE 2-2 Step (6) Rapid Rapid cooling cooling Heating Soaking Holding starting Rapid ending Overaging Overaging rate temperature time v1 temperature cooling rate temperature temperature time No. (° C./s) (° C.) (s) (° C./s) (° C.) (° C./s) (° C.) (° C.) (s) Example 1 5 850 55 3 780 500 210 210 240 Example 2 8 835 40 6 750 1000 150 150 400 Example 3 10 820 30 9 720 70 320 320 180 Example 4 12 800 10 10 710 20 450 450 100 Example 5 15 900 70 15 700 100 200 400 200 Example 6 20 950 90 20 700 200 240 280 240 Example 7 5 850 55 3 780 500 210 210 240 Example 8 8 835 40 6 750 1000 150 150 400

[0068] In order to verify the implementation effect of the present disclosure and prove the excellent effect of the present disclosure compared with the prior art, the rolled clad plates of carbon steel and austenitic stainless-steel of Example 1-6 according to the present disclosure were tested, and the test results were listed in Table 3.

TABLE-US-00004 TABLE 3 Mechanical tensile properties Corrosion Tensile strength Yield strength Elongation Pitting corrosion Intergranular No. (MPa) (MPa) (%) potential (V) corrosion (Ra) Example 1 1710 1390 7.3 0.31 0.29 Example 2 1128 808 10.8 0.29 0.26 Example 3 968 514 15.2 0.31 0.39 Example 4 802 786 10.6 0.32 0.4 Example 5 1188 987 15.4 0.42 0.36 Example 6 1304 1171 8.6 0.41 0.29 Example 7 1690 1375 7.5 0.31 0.28 Example 8 1120 795 11.0 0.30 0.27

[0069] According to Table 3, it can be seen that the rolled clad plate of carbon steel and austenitic stainless-steel of each Example according to the present disclosure has a tensile strength of 802-1710 MPa, a yield strength of 514-1390 MPa, an elongation of 7.3-15.4%. The pitting corrosion was tested according to GB/T 17899-1999 stainless-steel pitting corrosion potential measurement method, and the intergranular corrosion performance was tested in accordance with ASTM G108-94. As can be seen from Table 3, each Example according to the present disclosure has a pitting corrosion potential of 0.29-0.42 V, and an intergranular corrosion of 0.26-0.4 Ra, indicating that the corrosion resistance of each Example according to the present disclosure is excellent.

[0070] Based on the above, the rolled clad plate of carbon steel and austenitic stainless-steel manufactured by the method of the present disclosure comprises an austenitic stainless-steel layer that guarantees corrosion resistance energy and a carbon steel layer that provides a basis of different specific mechanical properties for the overall steel plate at the same time, so that the final steel plate has different strength grades of from 780 MPa to 1700 MPa and excellent corrosion resistance.

[0071] It's to be noted that the prior art portions in the protection scope of the present disclosure are not limited to the examples set forth in the present application document. All the prior art contents not contradictory to the technical solution of the present disclosure, including but not limited to prior patent literatures, prior publications, prior public uses and the like, may all be incorporated into the protection scope of the present disclosure.

[0072] In addition, the ways in which the various technical features of the present disclosure are combined are not limited to the ways recited in the claims of the present disclosure or the ways described in the specific examples. All the technical features recited in the present disclosure may be combined or integrated freely in any manner, unless contradictions are resulted.

[0073] It should also be noted that the examples set forth above are only specific examples according to the present disclosure. Obviously, the present disclosure is not limited to the above examples. Similar variations or modifications made thereto can be directly derived or easily contemplated from the present disclosure by those skilled in the art. They all fall in the protection scope of the present disclosure.