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B Carbon Steel Carbon Steel ASTM A563-Grade may be C Quenched and Tempered Atmospheric corrosion ASTM A563-Grade Resistant Steel, C3 may be Quenched and Tempered Carbon Steel ASTM A563-Grade may be D Quenched and Tempered SAE J995-Grade 5 ASTM A563-Grade DH Carbon Steel SAE J995-Grade 2 Over 1 thru 1-1/2 1/4 thru 1-1/2 1/4 thru 4 105 90 144 - B78 C32 C38 11 5 1/4 thru 4 144 B78 C38 5,9 1/4 thru 4 150 B84 C38 6 1/4 thru 1 120 - C32 12 Carbon Steel, Quenched and Tempered Atmospheric corrosion ASTM A563-Grade Resistant Steel, DH3 Quenched and Tempered ASTM A194-Grade 1 Carbon Steel 1/4 thru 4 175 C24 C38 6 1/4 thru 4 175 C24 C38 5,9 1/4 thru 4 1/4 thru 4 130 150 B70 159 - 352 2,7 2,7,8 ASTM A194-Grade Medium Carbon 2 Steel Medium Carbon ASTM A194-Grade Steel, 2H Quenched and Tempered 1/4 thru 4 175 C24 C35 2,7 Table 3 Continued next page
Table 3 Grade Identification Markings for Popular Grades of Carbon Steel Nuts
（Continued）
Grade Identification Marking Nominal Size in. Proof Hardness Load Rockwell硬Stress 度 ksi保Min Max 载 See Note Specification Material 2020-4-19第 - 6 - 页 共 23 页
青岛天时海洋石油装备有限公司
See Notes 1,2 NOTES：(备注)
Medium Carbon ASTM Steel, 1/4 thru 4 A194-Grade 2HM Quenched and Tempered Medium Carbon 1/4 thru 5/8 Steel, SAE J995-Grade 8 Quenched and over 5/8 thru 1 >1＂ Tempered Medium Carbon ASTM Alloy Steel, 1/4 thru 4 A194-Grade 4 Quenched and Tempered Medium Carbon ASTM Alloy Steel, 1/4 thru 4 A194-Grade 7 Quenched and Tempered Medium Carbon ASTM Alloy Steel, 1/4 thru 4 A194-Grade 7M Quenched and Tempered 10 150 150 150 150 175 159 C24 C26 C26 C24 237 C30 C34 C36 C38 2,7,8 12 2,7 175 C24 C38 2,7 150 159 237 2,7,8 2. The markings shown for all grades of A194 nuts are for cold formed
and hot forged nuts. When nuts are machined from bar stock, the nut must be additionally marked with the letter‘B’.The letters H and M indicate heat the ated nuts.
除所列等级标记外，所有等级（除A563，O、A、B级外），必需注明厂家自己标记。 1. In addition to the indicated grade marking, all grades, except A563 grade O, A and B, must be marked for manufacturer identification.
3. Nuts are not required to be marked unless specified by the purchaser.
When marked, the identification marking shall be the grade letter O, A or B. 4. Properties shown are those of non plated or non coated coarse
thread hex nuts. For properties of other nut styles, nuts with fine threads, and plated or coated nuts, refer to Table 3, page B-171. 5. Properties shown are those of coarse thread heavy hex nuts.
A194标准，所有螺帽都是冷墩成型和热处锻造成型螺帽。当螺帽是由棒钢机械加工而成时，需在标记上加字母“B”；字母“H”和“T”表示是经热处理的螺帽。 如购货方无特殊要求，螺帽上可以不注明等级标记。如果要注明的话，等级标记为字母O、A或B。 所示机械性能，是非电镀、粗牙、六角螺帽的机械性能。细牙、电镀螺帽的机械性能，参阅B171页，表3。 6. Properties shown are those of coarse thread heavy hex nuts. For
properties of other nut styles and nuts with fine threads, refer to Table 3, page B-112. 7. Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
For properties of coarse and 8-pitch hex nuts, refer to Table 3, page B-132.
2020-4-19第 - 7 - 页 共 23 页
所示机械性能是粗牙、重型六角螺帽的机械性能。 所示机械性能是粗牙、重型六角螺帽的机械性能。细牙螺帽和其它类别螺帽的机械性能参阅B-112页，表3。
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8. Hard-nesses are Brinell Hardness Numbers.
所示机械性能是粗牙，牙数为8的重型六角螺帽的机械性能。粗牙，牙数为8的普通六角螺帽的机械性能参阅B132页，表3。 9. The nut manufacturer, at his option, may add other markings to indicate
the use of atmospheric corrosion resistant steel. 10. Specifications（详细说明）—
ASTM A563-Carbon and Alloy Steel Nuts, page B-167.
硬度是布氏硬度。 如采用防腐蚀钢材，螺帽生产厂家可增加其它标记。 ASTM书A563-碳钢、合金钢螺帽，B-167页。 ASTM A194/A194M-Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service, page B-126.
ASTM A194/A194M –经高压、高温处理的，和螺栓配套的碳钢，合金钢螺帽。
11. Grade 2 不需打任何标记。 12. Grade 5 and 8应标记等级。 HV表示维氏硬度，是硬度的一种测量方法及单位； KSI是千磅/平方英寸，是压强，具体地说是抗拉强度单位； 抗拉强度和硬度之间非线性关系，一般可以查表换算： 104KSI=HV220；HV250=116KSI
1 KSI = 1000 lb / in.2 = 1000 x 0.4536 x 9.8 N / (25.4 mm)2 = 6.89 N / mm2
Table 2 Grade Identification Markings for Popular Grades of Carbon Steel
Externally Threaded Fasteners Grade Identification Marking SAE J429-Grade 2 Low or Medium ASTM A307-Grade Carbon Steel A ASTM A307-Grade B Specification Material Hardness Proof Tensile Rockwell Load Nominal Size in. Stress Strength ksi Min ksi Min Max 1/4 thru 1-1/2 1/4 thru 3/4 over 3/4 thru 1-1/2 1/4 thru 4 33 55 33 - - - 60 74 60 60 B70 B100 B80 B100 B70 B100 B69 B100 See Note SAE J429-Grade 1 307A 307B 1/4 thru 4 60min B69 100max B95 2020-4-19第 - 8 - 页 共 23 页
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No Mark SAE J429-Grade 4 SAE J429-Grade 5.1 A325 SAE J429-Grade 5 ASTM A449-Type1 ASTM A449-Type1 SAE J429-Grade 5.2 ASTM A449-Type 2 ASTM A325-Type1 ASTM A325-Type3 Medium Carbon Steel, Quenched 1/4 thru 1-1/2 and Tempered Medium 1/4 thru 1 Carbon Steel, over 1 thru Quenched 1-1/2 and Tempered over 1-1/2 thru 3 Low or Medium Carbon Steel, No.6 thru 1/2 Quenched and Tempered Low Carbon Martensite Steel, 1/4 thru 1 Quenched and Tempered Medium Carbon Steel, Quenched and Tempered 1/2 thru 1 Atmospheric over 1 to 1-1/2 corrosion Resistant Steel, Quenched and Tempered Table 2 Continued next page
65 115 - - 仅指studs 85 74 55 120 105 90 C25 C19 183 C34 C30 235 3 85 120 C25 C40 4 C26 85 120 C25 C36 C34 5 85 74 120 105 C24 C19 C35 C31 6 Table 2 Grade Identification Markings for Popular Grades of Carbon Steel
Externally Threaded Fasteners（Continued） Proof Tensile Hardness Grade Nominal Size Load Strength Rockwell IdentificatiSpecification Material in. Stress Min on Marking Min Max ksi ksi Medium Carbon Alloy ASTM Steel, 1/4 thru 2-1/2 105 125 C26 C36 A354-Grade BC Quenched and Tempered Medium SAE J429-Grade Carbon Alloy Steel, 1/4 thru 1-1/2 105 133 - - 7 Quenched and Tempered Medium SAE J429-Grade Carbon Alloy 1/4 thru 1-1/2 120 150 C33 C39 8 Steel, 2020-4-19第 - 9 - 页 共 23 页
See Note 热处理后再辗牙 青岛天时海洋石油装备有限公司
BD ASTM A354-Grade BD Quenched and Tempered 1/4 thru 2-1/2 120 150 C33 C39 7 仅指studs No Mark A490 A490 Medium SAE J429-Grade Carbon Alloy 1/4 thru 1-1/2 8.1 or SAE 1541/1541H Low Carbon martensite SAE J429-Grade Steel, 1/4 thru 1 8.2 Quenched and Tempered Medium Carbon Alloy ASTM A490-Type Steel, 1/2 thru 1-1/2 1 Quenched and Tempered Low Carbon Marten-site ASTM A490-Type Steel, 1/2 thru 1 2 Quenched and Tempered Atmospheric Corrosion ASTM A490-Type Resistant 1/2 thru 1-1/2 3 Steel, Quenched and Tempered 120 150 - - 120 150 C33 C39 120 150 min 170max C33 C38 120 150 min 170max C33 C38 120 150 min 170max C33 C38 6 NOTES：(备注)
1.In addition to the indicated grade marking, all grades included in this table must be marked for manufacturer identification. 除所列等级标记外，此表中所有等级必需标注厂家自己的标记。
2.While hex heads are shown, grade markings apply equally to products with other head configurations. 如果是六角头型，等级标记等同和其它头型。
3.Hardnesses are Brinell Hardness Numbers. 硬度为布氏硬度。
4.Grade 5.1 is a popular grade for SEMS. SEMS产品常用等级是5.1级，参阅J-10页。 5.A325 Type 1 bolts may also be marked with 3 radial lines 120°apart in addition to A325 marking. A325 1类产品，等级标记为 + A325 。
6.The bolt manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel. 如采用防腐蚀钢材，厂家可增加其它标记来表明使用的是耐腐蚀钢材。
7.ASTM A354 Grade BD may have optionally six radial lines. ASTM A354 BD级可采用六条线标记。 8.Specifications—（详细说明：）
SAE J429 — Mechanical and Material Requirements for Externally Threaded
Fasteners, page B-79.
SAE J429—外螺纹紧固件 机械性能和材质要求，B-79页。
ASTM A307— Carbon Steel Externally Threaded Standard Fasteners, page B-90.
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英制螺栓机械性能要求 - 图文
