訂Order
1247813 A71247813 A7
1247813 A7 B7 五、發明說明（2 ) 分比17%前提T，考慮有I夭斯田鐵相之穩定元素，如錦、 銅、錳、氮、碳等影響’但因並未明確指出元素摻雜比 在何範圍内不致造成熱間加工之破裂，故仍無法根本解決 上述問題。 、 5 此外，日本特開昭61-124556號、特公平 等二發明專利案，分別是以添加^來對熱加工性，及熱脆 性作改良，基本上，與本發明之探討方向並不相同，故 多加贅述。 再者，中華民國專利第452_號發明專利案，企圖 10過壓低硫含量之生成，並添加舞、紹等脫氧劑以減少殘留 之介在物，增高其㈣性；然而，欲製造此種高清淨鋼須 用鋁脫氧，且加入鈣矽線以調整介在物成份，但鈣矽線之 回收率並不穩定，且須再增加冶煉時間及其原料成本，實 質煉鋼成本亦將提高，因此，亦無法相對節省成本，取r 競爭優勢。 f 綜上述’如何透過合金設計，利用猛、鋼、氣之添加 t部分之鎳含量，而發展出與304不銹鋼有相近耐蝕性 之合金材料，實為業界不斷開發研究的重要課題。 【發明概要】 20 因此，本發明之目的即在提供一種低鎳含量且耐蝕性 义好，適用於管件、淺衝加工之沃斯田鐵系不銹鋼。 人一於0，本發明一種低鎳含量之沃斯田鐵系不銹鋼，包 各一重量百分比介於〇·〇3與0.12之間的碳元素、一重量百 分比介於〇·2肖之間的矽元素、-重量百分比介於7·5 Α4規格（21Qx 297么^ —^ ---_ 1247813 A7 ___ B7 五、發明說明（3 ) ^~ 與10.5之間的錳元素、一重量百分比介於14〇與16 〇之 間的鉻元素、一重量百分比介於i.O與5〇之間的鎳元素、 一重量百分比介於0.04與0.25之間的氮元素、一重量百分 比介於1.0貞3.5之間的銅元素、至少包含翻之多數微量元 5素，及平衡之鐵元素，該沃斯田鐵系不錢鋼之一高溫肥粒 鐵相值（<5 -ferrite)不大於8.5,且該高溫肥粒鐵相值 = 6·77χ(絡 ％t + 翻 ％t + υχ 石夕 ％t ) _ 4 85χ(鎳汾 + 3〇χ 碳⑽ + 30χ 氮 + 〇·5χ 錳 + 0·3χ 銅 〇/〇t ) 一 52·75，其中 ％t 表 示重量百分比。 10【圖式之簡單說明】 本發明之其他技術内容、特徵及優點，在以下配合參 考圖式之較佳實施例的詳細說明中，將可清楚的呈現，在 圖式中： 第一圖是一實驗結果折線圖，說明本發明低鎳含量之 15沃斯田鐵系不銹鋼，熱軋溫度介於丨〇 5 〇它〜丨2 5 〇 °c時，高 溫肥粒鐵相值（5 -ferrite)不因溫度升高而增加，導致軋延 邊裂的產生； 表一是一比較表，說明高溫肥粒鐵相值（5 -ferrite)不 大於8.5時，不會產生邊裂缺陷之試驗結果； 20 表二是一比較表，說明本發明低鎳含量之沃斯田鐵系 不錄鋼與一般3 04不銹鋼，各試片之成分組成及其經過鹽 霧試驗後之結果；及 表三是一比較表，說明本發明低鎳含量之沃斯田鐵系 不錄鋼與一般304不銹鋼各試片之機械性質。 本紙張尺度適用中國國家標準（CNS) A4規格（21〇x 297公釐) ' 第6頁 1247813 A7 B7 五、發明說明（4 ) 【發明之詳細說明】 本發明一種低鎳含量之沃斯田鐵系不銹鋼是以習知狄 龍組織圖所得之5 ο-f計算方式為理論根據，並詳細研究其 中添加兀素比重之影響，並由實際實驗測量測肥粒鐵殘留 5量與各成分元素作線性回歸，而發展一能更準確預測沃斯 田鐵系不銹鋼機械性質之高溫肥粒鐵相值計算公式（以下 均稱本發明之高溫肥粒鐵相值為「5-f」），5-f=6.77x(鉻 %t + 鉬 ％t + ΐ·5χ 矽。/“）一 4·85χ(鎳 ％t + 3〇χ 碳 ％ + 術氮 %t + 0·5χ錳％t + 0上銅％ ) — 52 75 ;同時，控制添加之 10 碳（c)之重量百分比介於〇〇3與〇12之間、矽（μ)之 重量百分比介於〇·2與1_〇之間、錳（Μη)之重量百分比 介於7.5與10·5之間、鉻（c〇之重量百分比介於14〇與 16·0之間、鎳（Ni)之重量百分比介於1.0與5·〇之間、 氮（Ν)之重量百分比介於〇〇4與〇·25之間、銅（c^之 15重量百分比介於"與3·5之間、多數微量元素 鐵元素格），該些微量元素至少包含鉬（M 、 ^ . . ^ JUppm 的棚（）、小於15GPPm的硫⑻、重量百分比小於 的磷（P) ’並使5 -f不大於8.5,而完成本發明低鎳含量 之沃斯田鐵系不銹鋼，而可以低鎳含量且低鉻含量、 20降低原料成本，並保有良好的财蚀性，而可取 304不錄鋼用於—般較不嚴苛之使用條件，如刀」又 加工之一般器皿等用途。。 、淺衝 由於轉為貴金屬，必須儘量降低必要用料量，、 原料成本，但錄又是沃斯田鐵相之重要 、降低 心兀京，可抑制 A4規格⑽χ 297公愛） 第7頁 1247813 A7 __B7 五、發明說明（5 ) 沃斯田鐵相轉變為麻田散鐵相，同時增加不錄鋼本身之耐 還原酸之能力，並可提升冷作性，因此本發明之重點在於 降低鎳之重量百分比介於1.0至5·〇之間，以大幅降低原料 成本’同時仍可保有不銹鋼本身之耐姓性，及相關機械性 5質。 而鉻為主要抗蝕，以及肥粒鐵相之穩定元素，但同時 為了原料成本考量，因此控制添加鉻之重量百分比介於14 與1 6之間，此外，氮、猛及銅均為沃斯田鐵相之穩定元素， 因此以重量百分比介於〇·〇4至〇·25的氮、重量百分比介於 10 7.5至10.5的錳，與重量百分比介於1〇至3·5的銅，取代 部分鎳、降低原料成本。 石灰馬沃斯田鐵相之強穩定元素 ▼ 丹里ϊ日π〜 太高易使耐#性降低’纟易誘發麻田散鐵導致時效破裂， 因此本發明低鎳含量之沃斯田鐵系不銹鋼，控制添加之碳 15 20 (C)之重量百分比介於〇.〇3與〇12之間；同時，在不錢 鋼精煉過程中，必須以矽作為脫g逾丨、仓> 1卞馬脱虱劑進行脫氧，因此必須 有一預定之重量百分比，作异放回拄 1一疋矽冋時不利於沃斯田鐵相之 穩疋’因此控制碎（Si )之重暑石八μμ八 垔1百刀比介於〇·2與1.0之間。 再者，限制硼之重量百分比介 ” ％ 5〜30Ppm，可使本發 明低鎳含量之沃斯田鐵系不錄相沾勒Λ 一 科示不銹鋼的熱加工性較佳；而硫、 磷有害雜質元素，雖然含看侖彳《各乂土 S $愈低愈佳，但同時考量精煉盤 程成本時，則僅需限制硫含量】於 各$小於15〇Ppm，磷之重量百分 比小於0.06即可。 i w 參閱第一圖，由實際實驗 可知’當本發明低鎳含量之 本紙張尺度適用中國國家標準（CNS) 12478131247813 A7 B7 V. INSTRUCTIONS (2) The ratio of 17% premise T, consider the stability of the iron phase of I夭stian, such as Jin, Cu, Mn, Nitrogen, Carbon, etc. 'But because the element is not clearly indicated In the range of the ratio, the rupture of the inter-heat processing is not caused, so the above problem cannot be solved fundamentally. 5 In addition, the two invention patents, such as JP-A-61-124556 and Tee, are improved by hot addition and hot brittleness, respectively. Basically, they are not in the same direction as the present invention. Therefore, more details are given. Furthermore, in the case of the invention patent of the Republic of China Patent No. 452_, it is attempted to create a low-sulfur content of overpressure and to add a deoxidizer such as a dance or a sulphur to reduce the residual matter and increase its (four) nature; however, to create such a high Clean steel must be deoxidized with aluminum, and calcium lanthanum line is added to adjust the composition of the medium, but the recovery rate of calcium lanthanum line is not stable, and the smelting time and raw material cost must be increased, and the actual steelmaking cost will also increase. It is also impossible to save costs and take advantage of r. f In the above-mentioned way, how to develop the alloy material with the similar corrosion resistance of 304 stainless steel by using the nickel content of the t-part of the alloy, the steel, and the gas, is an important subject for continuous research and development in the industry. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a Worstian iron-based stainless steel which has a low nickel content and good corrosion resistance and is suitable for pipe fittings and shallow punching. When the human is at 0, the present invention is a low-nickel content of Wostian iron-based stainless steel, which contains one weight percent of carbon between 〇·〇3 and 0.12, and a weight percentage between 〇·2 肖矽 element, - weight percentage is between 7. 5 Α 4 specifications (21Qx 297? ^^^ ---_ 1247813 A7 ___ B7 V. Description of invention (3) Mn between 1~ and 10.5, a percentage by weight The chromium element between 14〇 and 16〇, the nickel element between 1O and 5〇, the weight of nitrogen between 0.04 and 0.25, and the weight percentage between 1.0贞3.5 The copper element, comprising at least a plurality of trace elements, and a balanced iron element, the iron phase value (<5-ferrite) of the high temperature fertilizer of the Vostian iron system is not more than 8.5, and the High-temperature fat grain iron phase value = 6.77χ (complex %t + turn %t + υχ石夕%t) _ 4 85χ(nickel 汾+ 3〇χ carbon (10) + 30χ nitrogen + 〇·5χ manganese + 0·3χ copper 〇/〇t ) a 52·75, where %t represents the weight percentage. 10 [Simple description of the drawings] Other technical contents, features and advantages of the present invention, In the following detailed description of the preferred embodiments with reference to the drawings, which will be clearly illustrated, in the drawings: the first figure is an experimental result line diagram illustrating the low nickel content of the 15 Vostian iron system of the present invention. Stainless steel, when the hot rolling temperature is between 丨〇5 〇 and it 丨2 5 〇°c, the high-temperature ferrite iron phase value (5-ferrite) does not increase due to the temperature increase, resulting in rolling edge cracking; Table 1 A comparison table, indicating that the high-temperature fertilizer grain iron phase value (5-ferrite) is not more than 8.5, the test result of the edge crack defect is not generated; 20 Table 2 is a comparison table indicating the low nickel content of the Worthite iron of the present invention. The non-recorded steel and the general 3 04 stainless steel, the composition of each test piece and the results after the salt spray test; and the third table is a comparison table, indicating that the low nickel content of the invention is not recorded in the Wostian iron system. The mechanical properties of the 304 stainless steel test pieces. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (21〇x 297 mm). Page 6 1247813 A7 B7 V. Description of invention (4) [Details of the invention] The invention relates to a low nickel content Worthfield iron stainless steel Based on the theoretical calculation of the 5 ο-f calculation method obtained from the traditional Dillon organization chart, and the influence of the specific gravity of the added halogen, and the actual experimental measurement of the residual amount of ferrite iron and the linear regression of each component element, Develop a formula for calculating the iron phase value of the high-temperature fertilizer grain of the Worthfield iron-based stainless steel (more specifically, the iron phase value of the high-temperature fertilizer of the present invention is "5-f"), 5-f=6.77x (Chromium % t + molybdenum % t + ΐ · 5 χ 矽. /") a 4.85 χ (nickel % t + 3 〇χ carbon % + operative nitrogen % t + 0 · 5 χ manganese % t + 0 on copper %) - 52 75 ; at the same time, control the addition of 10 carbon (c) The weight percentage is between 〇〇3 and 〇12, the weight percentage of 矽(μ) is between 〇·2 and 1_〇, and the weight percentage of manganese (Μη) is between 7.5 and 10·5, chromium (The weight percentage of c〇 is between 14〇 and 16:00, the weight percentage of nickel (Ni) is between 1.0 and 5·〇, and the weight percentage of nitrogen (Ν) is between 〇〇4 and 〇·25. Between, copper (15% by weight of c^ between " and 3.5, most trace element iron element), these trace elements contain at least molybdenum (M, ^ . . ^ JUppm shed (), Less than 15GPPm of sulfur (8), less than the weight of phosphorus (P) ' and 5 -f is not more than 8.5, and complete the low nickel content of the Worthfield iron-based stainless steel of the present invention, and can have a low nickel content and a low chromium content, 20 Reducing the cost of raw materials, and maintaining good financial and environmental properties, and it is desirable to use 304 stainless steel for the use of less stringent conditions, such as knives and processing of general utensils, etc. For the conversion to precious metals, we must minimize the amount of materials required, and the cost of raw materials. However, it is important for Worthite's iron phase, which reduces the heart's strength and can suppress A4 specifications (10) 297 297 public). Page 7 1247813 A7 __B7 V. DESCRIPTION OF THE INVENTION (5) The iron phase of Vostian is transformed into the iron phase of Ma Tian, and the ability to resist the reduction of acid is not increased, and the cold workability is improved. Therefore, the focus of the present invention is to reduce the weight percentage of nickel. Between 1.0 and 5·〇, to significantly reduce the cost of raw materials' while still retaining the resistance of stainless steel itself, and the related mechanical properties. Chromium is the main anti-corrosion, and the stable element of the ferrite iron phase, but at the same time In order to consider the cost of raw materials, the weight percentage of chromium added is controlled between 14 and 16. In addition, nitrogen, manganese and copper are stable elements of the iron phase of Vostian, so the weight percentage is between 〇·〇4 〇·25 nitrogen, weight percentage of manganese between 10 7.5 and 10.5, and copper with a weight percentage of between 1 〇 and 3.5, replacing part of nickel, reducing raw material cost. Strong stable element of lime Maworth Tiantie ▼ Dan Lie Day ~ Too high easy to make #耐性' 纟 诱发 诱发 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻 麻Between 3 and 〇12; at the same time, in the process of refining steel, it must be deoxidized with 矽 as a g 丨 丨 仓 仓 仓 , , , , , , , , , , , , , , , , , , , , , , Looking back at 1 疋矽冋 is not conducive to the stability of the iron phase of Vostian's. Therefore, the weight of the heat stone (8) is Between 2·2 and 1.0. Furthermore, limiting the weight percentage of boron by "% 5~30Ppm", the low-nickel content of the invention can not be recorded. The hot workability of the stainless steel is better; the sulfur and phosphorus are harmful. Impurity elements, although it contains the best of each 乂 彳 乂 , , , , , , , , , , , , , , , , , , , , , , , 考 考 考 考 考 精 精 精 精 精 精 精 精 精 精 精 精 精 精 精 精 精 精Iw Refer to the first figure, from the actual experiment, 'When the low nickel content of this paper is applied to the Chinese National Standard (CNS) 1247813
五、發明說明（6 沃斯田⑽、不錄鋼熱軋溫度超過125代 區，而隨著溫度升高而使肥__ 门酿相 升於戰，則不銹鋼之變形阻抗會 ;於1050°Γ ηα。 …軋月,J _材再熱溫度介 而1本發明/進行熱間軋延，可有效確保熱乳品質， 可清楚的明白，本發明低錄含量之同時由表-制占认。 $之，天斯田鐵系不錄鋼在控 制5-f不大於8.5後，綠實不會使邊裂缺陷產生 H)錄錮=閱表二，首先，本發明低錦含量之沃斯田鐵系不 = 佳實施例，可由表二中清楚的明白其多數種 銅的實Λ態樣(表中僅揭示出碳m 重量百八=重2百分比）’例如試片編冑1，即是碳之 八：二為_、，夕之重量百分比為〇48、猛之重量百 刀比為7.56、絡之重量百分比為15 26 15 〇·24、銅之重晉百八冰盔，％ 里里白刀比馬 重1百刀比為1.79，及硼之重量百 0.0001，因本發明低鎳含量之: 八的細人士』 現糸不銹鋼之組成成 刀的、σ方式眾多，在此不再多加舉例一 _。 比rH:由表二鹽霧試驗（ASTM BU7)之實驗結果 較表可知，本發明低鎳含量之沃斯田鐵系不錢鋼與一般 20 304 =錄鋼的多數試片，熱札後經酸洗及固溶後 行鹽霧試驗後之腐# i & I仏η，^ ^ ^ 之、夭斯… 明本發明低鎳含量 銹鋼，確實與—般3°4不鱗鋼具有相同之 苛!使用條：可取代部分一般304不銹鋼用於-般較不嚴 ° U牛，如管件、淺衝加工之一般器皿等用途。 本紙t Α4規格（210χ 297公釐） 1247813 五、發明說明（7 ) :閱表可知本發明低鎳含里之沃斯田鐵系不錄鋼 以厚度3公厘之試片進行機械強度試驗時，抗拉強度介於 618·4〜642·6 MPa、降伏強度介於289 / ττπ、 J J19.7 MPa、硬度 (HRB)介於82.3〜84·7，及伸長率介於s 亍丨 7、 53·1%〜55.3%，確 實較-般304不銹鋼的動性更佳’符合下游衝壓成型加工 之用途。 由於本發明低錄含量之沃斯田鐵系不錄鋼組Μ Μ 組合方式眾多，上述僅以表-、二中所載之少數試片成分 組合為例說明而已，熟悉此項技藝人士當知，本發明低鎳 10含量之沃斯田鐵系不銹鋼的組成成分，並不以表一、二中 所揭示為限。 — 综所上述，本發明低鎳含量之沃斯田鐵系不銹鋼是確 實依據實驗研究修正5_f的計算公式，同時詳細研究不錢 鋼中主要成分如碳、矽、錳、鉻、鎳、鉬、銅、氮、硼等 15元素之重量百分比及控"_£值，以減少錄之原料使用量， 大幅降低原料生產成本，同時仍保有不銹鋼之耐蝕性，及 衝壓成型之相關機械性質，而可取代部分一般3〇4不銹鋼 用於一般較不嚴苛之使用條件，如管件、淺衝加工之一般 器皿等用途，而可廣泛應用於業界，確實能達到發明之目 20 的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請^利 範圍及發明說明書内容所作之簡單的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 本紙張尺度適用中國國家標準（CNS) A4規;^ (21〇χ 297公董） 第10頁 1247813 試片編號 C Si Μη Cr Cu δ-f 邊裂缺陷 01 0.039 0.47 7. 07 19.04 2.15 28.58 有 02 0.050 0.45 7. 58 17.53 2. 03 15.82 有 03 0.046 0.47 7. 96 18.33 1.71 22.60 有 04 0.052 0.51 7.54 18.13 1.73 19.85 有 05 0. 051 0. 53 7.5 16.2 1.5 9.1 有 06 0. 053 0. 50 7.6 16.3 1.60 8.49 無 07 0.032 0. 53 7. 85 15.36 1.71 6.636 無 08 0.032 0. 54 8. 00 15.33 1.66 6. 259 無 09 0.032 0. 58 7. 54 15. 23 1.59 4.984 無 10 0.059 0. 62 7. 44 15.26 1.65 3. 859 無 11 0.046 0.42 7. 86 15.68 1.66 3.278 無 12 0.051 0.49 7. 63 15.16 1.62 1.684 無 13 0.060 0. 50 8. 08 15.14 1.70 0.109 無 14 0.066 0. 54 7. 76 14. 99 1.65 -1.989 無 表一 試片 編號 鋼種 C Si Μη Cr Cu B 腐姓結果 1 發明鋼 0.058 0.48 7. 56 15.26 1.79 0.0001 ^0.1% 2 發明鋼 0. 051 0. 54 7.86 15.35 1.69 0. 0032 ^0.1% 3 發明鋼 0.059 0.77 7.84 14·94 1.78 0. 0001 ^0.1% 4 一般 304 不燊鋼 0.045 0. 53 1.25 18.19 0.23 0. 0008 ^0.1% 表二 1247813 試片編號 抗拉強度 (MPa) 降伏強度 (MPa) 硬度 (HRB0 伸長率 (%) 一般 304 不銹鋼 1 657.8 322.8 81.8 48.5 2 660.0 324.6 83.2 49.1 3 660.6 325.0 82.6 47.8 4 663.8 328.9 82.4 48.8 發明鋼 5 641.9 301.6 83.4 53.4 6 621.7 313.3 83.5 55.2 7 630.2 289.5 82.5 55.3 8 628.5 287.6 82.3 55.0 9 642.3 291.3 82.8 53.1 10 618.4 312.0 84.3 53.7 11 634.6 296.4 82.8 53.8 12 639.0 317.2 83.9 54.1 13 642.6 319.7 84.7 54.3 14 621.7 313.3 83.5 55.2V. Description of the invention (6 Vostian (10), the hot rolling temperature of the unrecorded steel exceeds the 125th generation zone, and as the temperature rises, the fat __ is brewed, the deformation resistance of the stainless steel will be; at 1050° η ηα. ... rolling month, J _ material reheating temperature 1 invention / hot rolling, can effectively ensure the quality of hot milk, it can be clearly understood that the low recording content of the present invention is recognized by the watch system $,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Tian Tie is not a good example. It can be clearly seen from Table 2 that the majority of the copper is in the actual state (only the carbon m is one hundred and eight weight = 2%). For example, the test piece is compiled, ie It is the eighth of the carbon: the second is _, the weight percentage of the eve is 〇48, the weight of the weight is 7.5, the weight percentage of the collateral is 15 26 15 〇·24, and the copper is the heavy one, the ice helmet, % The white knife is 1.79 than the horse, and the weight of boron is 100,000. Because of the low nickel content of the invention: the fine person of the eight is now composed of stainless steel. There are many ways to σ, and no more examples are given here. Ratio rH: From the experimental results of the Table 2 salt spray test (ASTM BU7), it can be seen that the low-nickel content of the Worthian iron of the present invention is the majority of the test piece of the 20304 = recorded steel. After pickling and solid solution, after salt spray test, #i & I仏η, ^ ^ ^, muse... The low nickel content stainless steel of the invention is indeed the same as the general 3°4 non-scale steel. Harsh! Use strip: can replace part of the general 304 stainless steel for the general less than the degree of U cattle, such as pipe fittings, general processing of shallow processing and other purposes. Paper t Α4 size (210χ 297 mm) 1247813 V. Inventive Note (7): It can be seen that the low-nickel-containing Worthian iron in the invention is not subjected to mechanical strength test on a test piece having a thickness of 3 mm. , tensile strength between 618·4~642·6 MPa, lodging strength between 289 / ττπ, J J19.7 MPa, hardness (HRB) between 82.3~84·7, and elongation between s 亍丨7 5.31%~55.3%, it is better than the general 304 stainless steel's movability' in line with the downstream stamping processing. Due to the low number of combinations of the low-recording content of the Wostian Iron-based non-recorded steel group , ,, the above-mentioned only a few test piece combinations contained in Tables - 2 are used as an example, and those skilled in the art are aware of this. The composition of the low nickel content of the Vostian iron-based stainless steel of the present invention is not limited to those disclosed in Tables 1 and 2. — In the above, the low-nickel content of the Worthian iron-based stainless steel of the present invention is a calculation formula for correcting 5_f according to experimental research, and the main components of the non-constant steel such as carbon, bismuth, manganese, chromium, nickel, molybdenum, The weight percentage of 15 elements such as copper, nitrogen and boron, and the value of the control, to reduce the amount of raw materials used, greatly reduce the cost of raw material production, while still retaining the corrosion resistance of stainless steel and the mechanical properties related to stamping. It can replace the part of the general 3〇4 stainless steel for general less demanding use conditions, such as pipe fittings, general wares for shallow processing, etc., and can be widely used in the industry, and can indeed achieve the purpose of the invention. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change and modification according to the scope of the present invention and the contents of the invention description. All should remain within the scope of the invention patent. This paper scale applies to China National Standard (CNS) A4 regulations; ^ (21〇χ 297 DON) Page 10 1247813 Test piece No. C Si Μη Cr Cu δ-f Edge crack defect 01 0.039 0.47 7. 07 19.04 2.15 28.58 Yes 02 0.050 0.45 7. 58 17.53 2. 03 15.82 There are 03 0.046 0.47 7. 96 18.33 1.71 22.60 Yes 04 0.052 0.51 7.54 18.13 1.73 19.85 There are 05 0. 051 0. 53 7.5 16.2 1.5 9.1 Yes 06 0. 053 0. 50 7.6 16.3 1.60 8.49 No 07 0.032 0. 53 7. 85 15.36 1.71 6.636 No 08 0.032 0. 54 8. 00 15.33 1.66 6. 259 No 09 0.032 0. 58 7. 54 15. 23 1.59 4.984 No 10 0.059 0. 62 7 44 15.26 1.65 3. 859 None 11 0.046 0.42 7. 86 15.68 1.66 3.278 No 12 0.051 0.49 7. 63 15.16 1.62 1.684 No 13 0.060 0. 50 8. 08 15.14 1.70 0.109 No 14 0.066 0. 54 7. 76 14. 99 1.65 -1.989 No table No. 1 test piece No. C Si Μ Cr Cr Cu B Corruption result 1 Inventive steel 0.058 0.48 7. 56 15.26 1.79 0.0001 ^0.1% 2 Invention steel 0. 051 0. 54 7.86 15.35 1.69 0. 0032 ^ 0.1% 3 invention steel 0.059 0.77 7.84 14·94 1.78 0. 0001 ^0.1% 4 general 304 stainless steel 0.045 0. 53 1.25 1 8.19 0.23 0. 0008 ^0.1% Table 2 1247813 Test piece No. Tensile strength (MPa) Degradation strength (MPa) Hardness (HRB0 Elongation (%) General 304 Stainless steel 1 657.8 322.8 81.8 48.5 2 660.0 324.6 83.2 49.1 3 660.6 325.0 82.6 47.8 4 663.8 328.9 82.4 48.8 Inventive steel 5 641.9 301.6 83.4 53.4 6 621.7 313.3 83.5 55.2 7 630.2 289.5 82.5 55.3 8 628.5 287.6 82.3 55.0 9 642.3 291.3 82.8 53.1 10 618.4 312.0 84.3 53.7 11 634.6 296.4 82.8 53.8 12 639.0 317.2 83.9 54.1 13 642.6 319.7 84.7 54.3 14 621.7 313.3 83.5 55.2