ASTM A301L
上海圓鼎
 
〓〓〓〓〓〓上海圓鼎歡迎您〓〓〓〓〓〓〓〓
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
一、ASTM A301L介紹：
ASTM A301L超低碳鋼，比301耐晶間腐蝕性能好。ASTM A301L是在301鋼基礎(chǔ)上，降低C含量，改善焊口的抗晶界腐蝕性;通過添加N元素來彌補含C量降低引起的強度不足，保證鋼的強度。
二、ASTM A301L應(yīng)用和特性：
ASTM A301L耐熱性能
良好的抗氧化性能可保持到溫度高達840°C(如果是間歇使用的狀態(tài))及900°C(如果是連續(xù)使用的狀態(tài))。暴露于400°C以上會造成加工硬化效果的逐漸喪失，800°C時強度相當于退火的301。在蠕變條件下，加工硬化的301強度甚至?xí)陆档降陀谕嘶鸬?01。
ASTM A301L典型應(yīng)用：軌道車輛結(jié)構(gòu)部件 -- 滾壓成形、折彎成形或拉伸成形制成型材，也采用板材。飛機機身、公路拖車、汽車輪轂蓋、雨刮器夾持器具、烤面包機彈簧、爐子夾具、屏幕框架、幕墻等。
 
四、ASTM A301L化學(xué)成分：

碳C	硅Si	錳Mn	磷P	硫 S	鉻Cr
≤0.030	≤1.00	≤2.00	≤0.045	≤ 0.030	16-18
鎳Ni	鉬Mo	氮N	銅Cu	鐵Fe	鈮Nb
5-8	≤	≤0.20	≤	余量	≤
硼B(yǎng)	鈦Ti：	鋁Al	釩 V	鎢W	鈰Ce
≤	≤	≤	≤	~	~

五、ASTM A301L材質(zhì)規(guī)格：
冷扎薄板0.05mm-4.0mm,熱扎板:4mm~14mm,帶2mm-10mm,各尺寸規(guī)格鍛件環(huán)件，庫存?zhèn)€別牌號不定尺。
六、ASTM A301L物理性能：

熔點/℃	比熱容 /kg/(kg.k)℃ 0-100℃	熱導(dǎo)率/w/(m.k) 100~500℃	線脹系數(shù) /(10-6/k) 100~500℃	電阻率 /（Ω.mm2/m) 20℃	縱向彈性模量 /GPa 20℃
	0.5	16.3-21.5	16.5-18.7	0.73	193
密度g/cm	硬度HBW	硬度HRB	磁性
7.93		91	無

七、ASTM A301L力學(xué)性能:

標準號產(chǎn)品名稱	狀態(tài)	硬度（不大于）	拉伸強度Σb\MPa ≥	延伸率A/% ≥	斷面收縮Z/%≥
ASTMA240/A240M-16A不銹鋼熱軋	固溶處理	241HBW 100HRB	550	45

圓鼎小知識（固溶作用）：
①鋼中合金碳化物的析出與溶解
鋼中C是所含合金元素之一，其除能起到一點強化作用之外，對耐蝕性是不利的，特別是C與Cr形成碳化物時，作用更壞，應(yīng)力求減少它的存在。為此，依據(jù)C在奧氏體中隨溫度不同而變化的特性，即在高溫時溶解度大，低溫時溶解度小。有資料報導(dǎo)，C在奧氏體中的溶解度在1200℃時為0.34％；1000℃時為0.18％，而600℃時為0.02％，室溫時則更少。所以將鋼加熱到高溫，使C-Cr化合物充分溶解，再快速冷卻，讓其來不及析出，保證鋼的耐蝕性，特別是耐晶間腐蝕性。
②σ相
奧氏體鋼如果在500-900℃區(qū)間長時間加熱，或鋼中加入Ti、Nb、Mo等元素時，都會促進σ相析出，使鋼增加脆性和降低耐蝕性，消除σ相的手段也是在高于其可能析出溫度使其溶解，再快速冷卻，防止再析出。
 
工藝：
在標準中，推薦加熱溫度范圍較寬：1000~1150℃，通常采用1020-1080℃。考慮具體牌號成分，是鑄件還是鍛件等情況，在允許范圍內(nèi)，適當調(diào)節(jié)加熱溫度。加熱溫度低，C-Cr碳化物不能充分溶解，溫度太高，也存在晶粒長大，降低耐蝕性問題。
 
冷卻方式：應(yīng)以較快速度冷卻，防止碳化物再析出。在我國及其它一些國家標準中，標明固溶化后“快冷” ，綜合不同文獻資料和實踐經(jīng)驗，“快”的尺度可按如下情況掌握：
• 含C量≥0.08%的;含Cr量>22％、Ni量較高的；含C量雖<0.08％，但有效尺寸>3mm的，應(yīng)水冷;
• 含C量<0.08％、尺寸<3mm，可風冷;
• 有效尺寸≤0.5mm的可空冷
 
七、ASTM A301L加工處理和焊接性能:
ASTM A301L所有標準的焊接方法都適用。建議使用308L填充。ASTM A301L需要高強度的場合。它的加工硬化率很高， 大約14MPa/%Ra(每1%冷加工減面率，抗拉強度增加14MPa)，因此通過冷軋和冷成型可達到很高的強度。其金相結(jié)構(gòu)中至少有一部分應(yīng)變硬化的奧氏體轉(zhuǎn)變?yōu)轳R氏體。301盡管強度高，但仍有足夠的殘余延展性進行大量的冷成形。其退火狀態(tài)下無磁性，但冷加工后有很強磁性。
ASTM A301L可根據(jù)您所需要硬度及寬度交貨，1/2H  3/4H H EH TH等  
〓如有不盡之處可撥打上海圓鼎熱線詳細咨詢〓〓