{"id":2256,"date":"2022-04-07T07:58:09","date_gmt":"2022-04-07T07:58:09","guid":{"rendered":"https:\/\/tuspipe.com\/?page_id=2256"},"modified":"2025-11-07T07:49:23","modified_gmt":"2025-11-07T07:49:23","slug":"jis-g3444","status":"publish","type":"page","link":"https:\/\/www.tuspipe.com\/standards\/jis-g3444\/","title":{"rendered":"JIS G3444"},"content":{"rendered":"\t\t
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JIS G3444<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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TUSPIPE strictly adheres to the standard requirements when producing JIS G3444 standard steel pipes, paying meticulous attention to every step from raw materials to delivery. The product range covers five grades: JIS G3444 STK 290, JIS G3444 STK 400, JIS G3444 STK 490, JIS G3444 STK 500, and JIS G3444 STK 540.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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JIS G3444<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The Japanese Industrial Standard<\/a> JIS G3444<\/a> is the standard for Carbon steel pipes used in general structural and low-pressure applications such as engineering, architecture, piles, construction, and other general purpose applications.<\/strong> Carbon steel pipes are also known as black steel pipes. The JIS G3444 standard covers the dimensions, tolerances, test methods, and materials for Carbon steel pipes used in general structural and low-pressure applications. The standard does not cover Carbon steel pipes used in high-pressure applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Why choose tuspipe?<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Since 1998, Tianjin United Steel Piping Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.<\/p>

With over 500,000 tons annual production capacity, the company\u00a0serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.<\/p>

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,\u00a0 the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Steel Grade of JIS G3444 Pipes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Classification and Symbols of JIS G3444 Steel Pipes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tThe JIS G3444 tubes shall be classified into five grades, and symbols of grade and manufacturing method shall be as given in below.\n
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Symbol of Grade<\/th>\nSymbol of Manufacturing Method<\/th>\n<\/tr>\n
Tube Manufacturing Method<\/th>\nFinishing Method<\/th>\nMarking<\/th>\n<\/tr>\n
STK 290<\/td>\nSeamless: S\nElectric resistance welding: E\nButt welded: B\nAutomatic arc welded: A<\/td>\nHot finished: H\nCold finished: C\nAs electric resistance welded: G<\/td>\nHot finished seamless steel tube: -S-H\nCold finished seamless steel tube: -S-C\nAs electric resistance welded steel tube: -E-G\nHot finished ERW steel tube: -E-H\nCold finished ERW steel tube: -E-C\nButt welded steel tube: -B\nAutomatic arc welded steel tube: -A<\/td>\n<\/tr>\n
STK 400<\/td>\n<\/tr>\n
STK 490<\/td>\n<\/tr>\n
STK 500<\/td>\n<\/tr>\n
STK 540<\/td>\n<\/tr>\n
1. Dimensions shall be marked by outside diameter and wall thickness.\n2. Manufacturer\u2019s name or its identifying brand\n3. Symbol indicating the type of coating (in the case of using coated steel sheet or coated steel strip).\nThis abbreviation for this symbol shall be as agreed between the purchaser and the manufacturer.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Chemical Composition of JIS G3444<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The tubes must be examined as per the standard, and the heat analysis results must match those in the table below. When the customer requests a product analysis, the tube must be tested as per the standard and the acquired product analysis values must meet the criteria in Table within the tolerances specified in Table of JIS G 0321.<\/p>\n

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Symbol of Grade<\/th>\nC<\/th>\nSi<\/th>\nMn<\/th>\nP<\/th>\nS<\/th>\n<\/tr>\n
JIS G3444 STK 290<\/td>\n\u2013<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.050%max.<\/td>\n0.050%max.<\/td>\n<\/tr>\n
JIS G3444 STK 400<\/td>\n0.25%max.<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.040%max.<\/td>\n0.040%max.<\/td>\n<\/tr>\n
JIS G3444 STK 490<\/td>\n0.18%max.<\/td>\n0.55%max.<\/td>\n1.65%max.<\/td>\n0.035%max.<\/td>\n0.035%max.<\/td>\n<\/tr>\n
JIS G3444 STK 500<\/td>\n0.24%max.<\/td>\n0.35%max.<\/td>\n0.30% to 1.30%<\/td>\n0.040%max.<\/td>\n0.040%max.<\/td>\n<\/tr>\n
JIS G3444 STK 540<\/td>\n0.23%max.<\/td>\n0.55%max.<\/td>\n1.50%max.<\/td>\n0.040%max.<\/td>\n0.040%max.<\/td>\n<\/tr>\n
Notes:
\n1. If necessary, other alloy elements than those given in this table may be added.
\n2. For STK540, the chemical composition of tubes of wall thickness over 12.5 mm may be agreed upon between the purchaser and the manufacturer.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Mechanical Properties of JIS G3444<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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- Tensile Strength and Yield Point or Proof Stress<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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To ensure the quality of steel tubes, they must be made with high-quality steel sheets or strips. These materials must then be tested to confirm their tensile strength, yield point, and proof stress. The tensile strength in the weld zone is also an important factor, and this must be confirmed as well. However, if the purchaser approves, the test for tensile strength in the weld may be omitted. All of these factors are important in ensuring that steel tubes are of the highest quality and will be able to withstand any stress or weight that is placed upon them.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Symbol of Grade<\/th>\nTensile Strength\nN\/mm2<\/th>\nYield Point or Proof Stress\nN\/mm2<\/th>\nWeld Tensile\nN\/mm2<\/th>\nFlattening Resistance Strength<\/th>\nBendability<\/th>\n<\/tr>\n
Distance between Flat Plates (H)<\/th>\nBending Angle, a)<\/th>\nInside Radius<\/th>\n<\/tr>\n
Applicable Outside Diameter<\/th>\n<\/tr>\n
All Outside Diameters<\/th>\nAll Outside Diameters<\/th>\nAll Outside Diameters<\/th>\nAll Outside Diameters<\/th>\n50 mm or under<\/th>\n<\/tr>\n
JIS G3444 STK 290<\/td>\n290 min.<\/td>\n\u2013<\/td>\n290 min.<\/td>\n2\/3D<\/td>\n90\u00b0<\/td>\n6D<\/td>\n<\/tr>\n
JIS G3444 STK 400<\/td>\n400 min.<\/td>\n235 min.<\/td>\n400 min.<\/td>\n2\/3D<\/td>\n90\u00b0<\/td>\n6D<\/td>\n<\/tr>\n
JIS G3444 STK 490<\/td>\n490 min.<\/td>\n315 min.<\/td>\n490 min.<\/td>\n7\/8D<\/td>\n90\u00b0<\/td>\n6D<\/td>\n<\/tr>\n
JIS G3444 STK 500<\/td>\n500 min.<\/td>\n355 min.<\/td>\n500 min.<\/td>\n7\/8D<\/td>\n90\u00b0<\/td>\n6D<\/td>\n<\/tr>\n
JIS G3444 STK 540<\/td>\n540 min.<\/td>\n390 min.<\/td>\n540 min.<\/td>\n7\/8D<\/td>\n90\u00b0<\/td>\n6D<\/td>\n<\/tr>\n
NOTE 1 In this table, D stands for the outside diameter of the tube.\nNOTE 2 1 N\/mm 2 = 1 MPa\nNote a) The bending angle shall be measured from the starting point of the bend.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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- Flattening<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The flattening test is a method of testing for flaws or cracks in seamless steel tubes, electric resistance welded steel tubes, or butt welded steel tubes. The test involves placing the tube between two plates and applying pressure to the top plate. The distance between the plates is regulated to ensure that the test is accurate. The flattening test is an important part of quality control for steel tubes, and it helps to ensure that the tubes are free from defects.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Tubes that are 50 mm or under in outside diameter can be specified for their bendability instead of their ability to be flattened. Other tubes must be tested for bendability by the standard, and the test piece must be free from flaws or cracks. The acceptable bend angle and an inside radius of bending are specified in the table above. This ensures that the tubes meet the necessary safety standards and can withstand the specified amount of pressure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Dimensional Tolerances of JIS G3444<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Classification<\/th>\nOutside Diameter b)<\/th>\nTolerances on<\/th>\nApplicable Division<\/th>\n<\/tr>\n
Outside Diameter c)<\/th>\n<\/tr>\n
Class 1<\/td>\nUnder 50mm<\/td>\n\u00b1 0.5mm<\/td>\nApplied when there is no specification.\nApplicable to hot-finished seamless steel tubes.<\/td>\n<\/tr>\n
50mm or Over<\/td>\n\u00b1 1%<\/td>\n<\/tr>\n
Class 2<\/td>\nUnder 50mm<\/td>\n\u00b1 0.25mm<\/td>\nApplied when there is a specification.\nNot applicable to hot-finished seamless steel tubes.<\/td>\n<\/tr>\n
50mm or Over<\/td>\n\u00b1 0.5%<\/td>\n<\/tr>\n
Notes<\/td>\na) For the local parts such as repaired parts if the wall thickness can be confirmed to be\nwithin the tolerance in the table below, the outside diameter tolerance of this table need not be applied.<\/td>\n<\/tr>\n
b) The method for measuring the outside diameter of tubes exceeding 350mm in outside diameter may be determined by the circumferential length. The mutual conversion of outside diameter D and the circumferential length l shall be by the following formula:\nD = l \u00a0\/ \u03c0\nWhere D: outside diameter (mm) \u00a0\u00a0\u00a0\u00a0l: circumferential length (mm) \u00a0\u00a0\u00a0\u03c0\uff1a3.1416<\/td>\n<\/tr>\n
c) The tolerances on the outside diameter of ends of electric resistance welded and automatic\narc welded steel tubes exceeding 350mm in outside diameter shall be \u00b10.5%\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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- Wall Thickness Tolerance a)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Classification<\/th>\nFor Seamless Steel Tube<\/th>\nFor Other than Seamless Steel Tube<\/th>\nApplicable Division<\/th>\n<\/tr>\n
Wall Thickness<\/th>\nTolerance of Wall Thickness<\/th>\nWall Thickness<\/th>\nTolerance of Wall Thickness<\/th>\n<\/tr>\n
Class 1<\/td>\nUnder 4mm<\/td>\n+0.6mm, -0.5mm<\/td>\nUnder 4mm<\/td>\n+0.6mm, -0.5mm<\/td>\nApplied when there is no specification.\nApplicable to hot-finished seamless steel tubes.<\/td>\n<\/tr>\n
4mm or Over<\/td>\n+15%, -12.5%<\/td>\n4mm or Over to and excl. 12mm<\/td>\n+15%, -12.5%<\/td>\n<\/tr>\n
12mm or Over<\/td>\n+15%, -1.5mm<\/td>\n<\/tr>\n
Class 2<\/td>\nUnder 3mm<\/td>\n\u00b10.3mm<\/td>\nUnder 3mm<\/td>\n\u00b1 0.3mm<\/td>\nApplied when there is a specification.\nNot applicable to hot-finished seamless steel tubes.<\/td>\n<\/tr>\n
3mm or Over<\/td>\n\u00b110%<\/td>\n3mm or Over to and excl. 12mm<\/td>\n\u00b110%<\/td>\n<\/tr>\n
12mm or Over<\/td>\n+10%\uff0c-1.2mm<\/td>\n<\/tr>\n
Notes<\/td>\na) The tolerances on the wall thickness of tubes exceeding 1016.0 mm in outside diameter may be agreed upon between the manufacturer and the purchaser.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t
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1. When Did Japan Stop Using JIS? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Japan has not ceased using JIS standards. However, on September 30, 2008, the transition from the previous JIS standards was completed, and we now exclusively use the latest 2015 JIS standards.<\/p>

Japanese industrial standards are developed and managed by JISC, forming the core of Japan’s national standards.<\/p>

JIS PDF Free Download \/ JIS Standards In English<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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2. Are JIS and ANSI Flanges Compatible? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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JIS and ANSI flanges are not fully compatible. At the same pressure rating, JIS 10K\/20K series flanges have larger dimensions than ANSI flanges. This results in misalignment of bolt holes during installation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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3. What Is the JIS Equivalent of 4140 Steel? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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It is JIS SCM440 and DIN 1.7225.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Line-Pipe\"\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t
Line Pipe<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"PIPE-COATING\"\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t
Coated Pipe<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"FIRE-PIPE-ASTM-A795-Grade-A\u200b-sprinkler-pipe-supplied-by-Tianjin-United-Steel-Pipe\"\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t
Fire Pipe<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Pipe-Fabrication-Spooling\"\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t
Steel Fabrication<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

JIS G3444 TUSPIPE strictly adheres to the standard requirements when producing JIS G3444 standard steel pipes, paying meticulous attention to every step from raw materials to delivery. The product range covers five grades: JIS G3444 STK 290, JIS G3444 STK 400, JIS G3444 STK 490, JIS G3444 STK 500, and JIS G3444 STK 540. JIS […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":3364,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"disabled","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-2256","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/pages\/2256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/comments?post=2256"}],"version-history":[{"count":0,"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/pages\/2256\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/pages\/3364"}],"wp:attachment":[{"href":"https:\/\/www.tuspipe.com\/wp-json\/wp\/v2\/media?parent=2256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}