ASTM A500 グレードD
TUSPIPE’s ASTM A500 Grade D tubes follow the highest strength level of the A500 standard. Customers gain premium structural tubing engineered for demanding environments and long-term durability.
ASTM A500 グレードD
ASTM A500 Grade D refers to a steel grade. The ASTM A500 standard defines steel grade D as structural steel with a minimum yield strength of 36,000 psi and a minimum ultimate tensile strength of 58,000 psi.
This steel grade is generally used in structural applications. The steel grade contains a higher carbon content. It also generally requires a heat treatment for shape (round, square, or rectangular) and greater dimensional accuracy.
タスパイプを選ぶ理由
1998年以来、天津聯合鋼管有限公司(TUSPIPE)は高品質のラインパイプの供給に尽力しています。
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TUSPIPEは製品の品質を重視し、厳格な品質管理を行っている。製品の品質を維持するため、2004年から試験検査センターを設立しました。最新の試験・検査設備を備え、引張試験、水力試験、衝撃試験、DWTTなどを実施することができます。
ASTM A500 Grade D Pipe Specification
| スタンダード | ASTM A500 – Cold Formed Square Hollow Sections Pipes |
|---|---|
| グレード | ASTM A500 Gr.D |
| 壁厚 | 0.5mm – 25mm |
| 長さ | 6000-14000 mm |
| タイプ | Seamless/ Welded / ERW / EFW |
| Dimensional Tolerances | Thickness: (All sizes +/- 10%) |
| Surface Protection | Black (Self Colored uncoated), Varnish/Oil Coating, Pre-Galvanized, Hot Dip Galvanized |
ASTM A500 Permissible Variation IN dIAMETER
| Typical Permissible Variations in Outside Diameter | |
|---|---|
| Specified Outside Large Flat Dimension, in. [mm] | Permissible Variations Over and Under Specified Outside Flat Dimensions, * in. [mm] |
| 2.500 [65] or under | 0.020 [0.5] |
| Over 2.500 to 3.500 [65 to 90], incl. | 0.025 [0.6] |
| Over 3.500 to 5.500 [90 to 140], incl. | 0.030 [0.8] |
| Over 5.500 [140] | 大平面寸法の0.01倍 |
Mechanical Properties of ASTM A500 Grade D
| 構造用丸パイプ | |
|---|---|
| グレード | Gr. D |
| 引張強さ、mn、ps (MPa) | 58 000 |
| (400) | |
| 降伏強さ、mn、psi（MPa） | 36 000 |
| (250) | |
| 伸度：2インチ（50.8 mm）、分、%A | 23C |
| Shaped Structural Tubing | |
|---|---|
| 鋼種 | Gr. D |
| 引張強さ、mn、ps (MPa) | 58 000 |
| (400) | |
| 降伏強さ、mn、psi（MPa） | 36 000 |
| (250) | |
| 伸度：2インチ（50.8 mm）、分、%A | 23C |
| *Applies to specified wall thicknesses (t) equal to or greater than 0.120″. For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: % elongation in 2″ = 56t+17.5, rounded to the nearest percent. | |
| ** Applies to specified wall thicknesses (t) equal to or greater than 0.180″. For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: % elongation in 2″ = 61t+12, rounded to the nearest percent. | |
| *** Applies to specified wall thicknesses (t) equal to or greater than 0.120″. For lighter specified wall thicknesses, the minimum elongation values shall be by agreement with the manufacturer. | |
Chemical Properties of ASTM A500 Grade D
| Typical Chemical Properties | ||
|---|---|---|
| Chemistry (%) | ASTM A500 | |
| Gr. D | ||
| 熱分析 | 製品分析 | |
| Carbon* | 0.26 Max | 0.30 Max |
| Manganese* | 1.35 Max | 1.40 Max |
| リン | 0.035 Max | .045 Max |
| Sulphur | 0.035 Max | .045 Max |
| Copper** | 0.20 Min | 0.18 Min |
| *For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.60% by product analysis | ||
| **If copper containing steel is specified in the purchase order | ||
Permissible Variations in Dimensions of ASTM A500 Grade D
-Outside Dimensions of ASTM A500 Grade D Pipes
ASTM A500 グレード D Round Structural Tubing
Specify an outside diameter of 1.9 inches [48 mm] or less with a tolerance not to exceed ±0.5%, rounded to 0.005 inch [0.1 mm], and an outside diameter of 2 inches or more [50 mm] allowing a tolerance of ±0.75%, rounded to 0.005 inch [0.1 mm].
ASTM A500 グレード D Square and Rectangular Structural Tubing
Outside dimensions, as measured across the flats at least 2in. [5cm] from the tube ends, shall not differ by more than the tolerance for convexity or concavity.
- Wall Thickness of ASTM A500 Grade D Pipes
At any point of measurement, the minimum wall thickness of the ASTM A500 Grade D tube shall not be less than 10% of the specified wall thickness. The maximum wall thickness of welded tubing shall not exceed 10% of the required wall thickness, excluding the weld seam.
Square and rectangular tube wall thickness specifications must be applied entirely to the flats’ centers.
-Length of ASTM A500 Grade D Pipes
Structural tubing is frequently made in random lengths of more than 5ft [1.5m], multiple lengths, and specialty lengths. Consult Section 4. When ordering certain lengths, compliance with the length tolerance is required.
-Straightness of ASTM A500 Grade D Pipes
For ASTM A500 Grade D structural tubes, the permissible variation must be 1/8in. times the number of feet [10 mm times the number of meters] divided by 5.
-Squareness of Sides of ASTM A500 Grade D Pipes
The adjacent sides of ASTM A500 Grade D square and rectangular structural tubes must be square (90°), with a maximum deviation of 62° permitted.
-Radius of Corners of ASTM A500 Grade D Pipes
Each outer corner radius of a square or rectangular structural tubing segment should not exceed three times the wall thickness necessary.
-Twist of ASTM A500 Grade D Pipes
Allowable twist variations in ASTM A500 Grade D square and rectangular structural tubing shall be as specified in the standard. Twist shall be determined by clamping one end of the tubing to a flat surface plate, measuring the height of each corner on the bottom side of the tubing above the surface plate near the opposite ends of the tubing, and calculating the twist (the difference in the heights of such corners), with the exception that for heavier sections, a suitable measuring device may be used to determine twist. Twist measurements must not be taken within two inches [five centimeters] of the tubing’s ends.
TUSPIPE ASTM A500 Grade D Marking
- The following information must be legibly inscribed on each length of ASTM A500 GradeD structural tubing: manufacturer’s name, brand, or trademark; specification designation (year of issuance is not necessary); and grade letter.
- The information given in (1) may be marked on a tag firmly connected to each bundle for ASTM A500 GradeD structural tubing with a specified outer diameter or big flat dimension of 4 in. [10 cm] or less.
- Bar Coding—In addition to the standards in (1) and (2), the manufacturer must be able to use bar coding as an additional way of identification. When a purchase order specifies a certain bar-coding system, that system must be used.
NOTE—In the absence of a purchase order specifying a different bar-coding method, it is suggested that bar coding adhere to AIAG Standard B-1.
