| 材料等级： | ASTM A213 | 标准： | TP347H |
|---|---|---|---|
| 尺寸 | 1/4’to 3′ | W.T.： | 1mm To 12mm |
| 长度 | 双随机，单随机，标准长度和切割长度 | 无损检测： | ET HT UT PT |
| 包装 | 胶合木箱/铁箱/捆包 | 申请： | Heat Exchangers/ Chemical |
| 强光 | Stainless Steel Seamless Heat Exchanger Tubes， TP347H Seamless Stainless Steel Tube， Chemical Seamless Stainless Steel Tubing | ||
ASTM A213 TP347H Stainless Steel For Heat Exchangers Chemical
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化学成分 ASTM A213 TP347H Stainless Steel
| 347 Stainless Steel Tube | 最大 | 最低 |
|---|---|---|
| 倪 | 13.00 | 9.00 |
| C | 00.08 | 00.04 |
| 锰 | 2.00 | – |
| P | 00.045 | – |
| S | 00.030 | – |
| Si | 1.00 | – |
| Cr | 20.0 | 17.0 |
| 莫 | 3 – 4 | – |
| N | – | – |
| OTHER | 1.0 | Nb=10(C+N) |
机械 P属性 的 ASTM A213 TP347H Stainless Steel
| 要素 | 347 Stainless Steel Tube |
|---|---|
| 密度 | 8.0 克/立方厘米 |
| 熔化范围 | 1454°C (2650°F) |
| 拉伸应力 | Psi – 75000 ， MPa – 515 |
| 屈服应力 (0.2%Offset) | Psi – 30000 ， MPa – 205 |
| 伸长率 | 35 % |
| 硬度（布氏硬度） | 201 |
Equivalent Grades Of ASTM A213 TP347H Stainless Steel
| 标准 | WERKSTOFF NR. | UNS |
|---|---|---|
| 347 Stainless Steel Tube | 1.4550 | S34700 |
Tolerances Of ASTM A213 TP347H Stainless Steel
| 规格 | Allowable Outside Diameter Variation in mm | Allowable Wall Thickness Variation | Exact Length Tolerance in mm | 测试 | ||||
| 公称直径 | 完毕 | 根据 | %Over | %Under | 完毕 | 根据 | ||
| ASTM-A213 TP347H Seamless Boiler Superheater and Heat Exchanger Tubes | Under 25.4 | .1016 | .1016 | +20 | -0 | 3.175 | 0 | 扁平化测试 |
| 25.4-38.1 incl | .1524 | .1524 | +22 | -0 | 3.175 | 0 | 拉力测试 | |
| 38.1-50.8 excl | .2032 | .2032 | +22 | -0 | 3.176 | 0 | Flare Test | |
| 50.8-63.5 excl | .254 | .254 | +2 | -0 | 4.46 | 0 | 硬度测试 | |
| 63.5-76.2 excl | .347H8 | .347H8 | +22 | -0 | 4.76 | 0 | 100% Hydrostatic test | |
| 76.2-101.6 incl | .381 | .381 | +22 | -0 | 4.76 | 0 | Refer to ASTM A-450 | |
overview:
Unlike several stainless steel alloy grades， 347 is a heat resistant metal. To stabilize the alloy， two elements， niobium and tantalum， have been added to the chemical composition of 347 stainless steel seamless tubing. Both niobium and tantalum are elements that are known as refractory metals. Refractory metals are elements that have a high resistance to both heat and wear. Therefore， it is not uncommon to find WERKSTOFF NR.1.4550 heat exchanger tubes in applications involving high temperatures. Many ASTM A213 TP 347 instrumentation tubes are used in the above applications due to the large amount of heat released by the heat exchanger during use.
In addition， the combination of heat and high pressure can wear out the system. Alloys stabilized with niobium and tantalum， such as 347 stainless steel tubing are suitable for these applications. 347 alloy not only has excellent heat resistance， but also has the ability to resist intergranular corrosion. The occurrence of chromium carbide is problematic in the temperature range of 800°F to 1500°F. It is in this temperature range that some alloys tend to notice a decrease in their mechanical properties. However， despite exposure to temperatures up to 1500°F， the mechanical properties of SS 347 cold rolled coiled tubing did not deteriorate.
However， more notable properties of ASTM A249 TP 347H welded pipe include higher creep strength and high stress fracture properties， both of which are significantly higher than 304 and 304L grades. In some cases， Grade 304L was replaced with the more robust UNS S34700 U-tube， as the former tends to be susceptible to intergranular corrosion. A common feature of this alloy with austenitic stainless steels is the good low-temperature toughness of SS 347 ERW Tubing.
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