Method of producing clad steel plate having good low-temperature toughness
First Claim
1. A method of producing clad steel plate comprising the steps of obtaining an assembly slab by superposing a stainless steel cladding material and a base metal consisting essentially of, by weight,
with the balance being iron and unavoidable impurities;
seal-welding the periphery of the assembly slab;
heating the slab to a temperature in the range of 1100°
to 1250°
C.;
rolling the slab at a reduction ratio of 5 or more;
rolling the slab at a finish temperature of 900°
to 1050°
C.;
air cooling the slab for 60 to 200 seconds to promote recrystallization of γ
structure;
cooling the slab from a temperature of at least 750°
to an arbitrary temperature of 550°
or below at a cooling rate of 5°
to 40°
C./sec; and
air cooling the slab.
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Accused Products
Abstract
A method of producing clad steel plate comprises the steps of preparing an assembly slab by superposing a stainless-steel or nickel alloy cladding material onto base metal consisting essentially of, by weight, 0.020 to 0.06% carbon, 0.5% or less silicon, 1.0 to 1.8% manganese, 0.03% or less phosphorus, 0.005% or less sulfur, 0.08 to 0.15% niobium, 0.005 to 0.03% titanium, 0.05% or less aluminum, 0.002 to 0.006% nitrogen, and one or two elements selected from among a group consisting of 0.05 to 1.0% nickel, 0.05 to 1.0% copper, 0.05 to 0.5% chromium, 0.05 to 0.3% molybdenum and 0.001 to 0.005% calcium, with the balance being iron and unavoidable impurities, and welding its periphery; heating the slab to 1100° to 1250° C.; rolling the slab at a reduction ratio of 5 or more and a rolling finish temperature of 900° to 1050° C.; air cooling for 60 to 200 seconds; cooling the slab from a temperature of at least 750° C. to 555° C. or below at a cooling rate of 5° to 40° C./sec, and following this by air cooling.
28 Citations
4 Claims
- 1. A method of producing clad steel plate comprising the steps of obtaining an assembly slab by superposing a stainless steel cladding material and a base metal consisting essentially of, by weight,
- space="preserve" listing-type="tabular">______________________________________ Carbon 0.020 to 0.06% Silicon 0.5% or less Manganese 1.0 to 1.8% Phosphorus 0.03% or less Sulfur 0.005% or less Niobium 0.08 to 0.15% Titanium 0.005 to 0.03% Aluminum 0.05% or less Nitrogen 0.002 to 0.006% ______________________________________
with the balance being iron and unavoidable impurities; seal-welding the periphery of the assembly slab; heating the slab to a temperature in the range of 1100°
to 1250°
C.;rolling the slab at a reduction ratio of 5 or more; rolling the slab at a finish temperature of 900°
to 1050°
C.;air cooling the slab for 60 to 200 seconds to promote recrystallization of γ
structure;cooling the slab from a temperature of at least 750°
to an arbitrary temperature of 550°
or below at a cooling rate of 5°
to 40°
C./sec; andair cooling the slab. - View Dependent Claims (2, 3, 4)
- 4. The method according to claim 1 wherein the base metal includes one or two elements selected from the group consisting of, by weight,
- space="preserve" listing-type="tabular">______________________________________ Nickel 0.05 to 1.0% Copper 0.05 to 1.0% Chromium 0.05 to 0.5% Molybdenum 0.05 to 0.3% Calcium 0.001 to 0.005%. ______________________________________
Specification
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- Resources
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Current AssigneeNippon Steel Corporation
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Original AssigneeNippon Steel Corporation
-
InventorsTamehiro, Hiroshi, Terada, Yoshio, Ogata, Yoshinori
-
Primary Examiner(s)Seidel, Richard K.
-
Assistant Examiner(s)Mah, Chuck Y.
-
Application NumberUS07/793,959Time in Patent Office445 DaysField of Search228/231, 228/263.15, 228/191, 228/186, 228/235, 420/126, 420/127, 420/128, 428/679, 428/683, 148/12 E, 148/12 EAUS Class Current228/186CPC Class CodesB21B 2001/383 Cladded or coated productsB21B 3/02 Rolling special iron alloys...B23K 20/227 with ferrous layerY10T 428/12937 Co- or Ni-base component ne...Y10T 428/12965 Both containing 0.01-1.7% c...
